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   <div id="projectname">SDL2_gfx
   &#160;<span id="projectnumber">1.0.1</span>
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   <div id="projectbrief">GraphicsprimitivesandsurfacefunctionsforSDL2</div>
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<a href="_s_d_l2__rotozoom_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*  </span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment">SDL2_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">Copyright (C) 2012  Andreas Schiffler</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">This software is provided &#39;as-is&#39;, without any express or implied</span>
<a name="l00008"></a>00008 <span class="comment">warranty. In no event will the authors be held liable for any damages</span>
<a name="l00009"></a>00009 <span class="comment">arising from the use of this software.</span>
<a name="l00010"></a>00010 <span class="comment"></span>
<a name="l00011"></a>00011 <span class="comment">Permission is granted to anyone to use this software for any purpose,</span>
<a name="l00012"></a>00012 <span class="comment">including commercial applications, and to alter it and redistribute it</span>
<a name="l00013"></a>00013 <span class="comment">freely, subject to the following restrictions:</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">1. The origin of this software must not be misrepresented; you must not</span>
<a name="l00016"></a>00016 <span class="comment">claim that you wrote the original software. If you use this software</span>
<a name="l00017"></a>00017 <span class="comment">in a product, an acknowledgment in the product documentation would be</span>
<a name="l00018"></a>00018 <span class="comment">appreciated but is not required.</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment">2. Altered source versions must be plainly marked as such, and must not be</span>
<a name="l00021"></a>00021 <span class="comment">misrepresented as being the original software.</span>
<a name="l00022"></a>00022 <span class="comment"></span>
<a name="l00023"></a>00023 <span class="comment">3. This notice may not be removed or altered from any source</span>
<a name="l00024"></a>00024 <span class="comment">distribution.</span>
<a name="l00025"></a>00025 <span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment">Andreas Schiffler -- aschiffler at ferzkopp dot net</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">*/</span>
<a name="l00029"></a>00029 
<a name="l00030"></a>00030 <span class="preprocessor">#ifdef WIN32</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#include &lt;windows.h&gt;</span>
<a name="l00032"></a>00032 <span class="preprocessor">#endif</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<a name="l00035"></a>00035 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00036"></a>00036 
<a name="l00037"></a>00037 <span class="preprocessor">#include &quot;<a class="code" href="_s_d_l2__rotozoom_8h.html">SDL2_rotozoom.h</a>&quot;</span>
<a name="l00038"></a>00038 
<a name="l00039"></a>00039 <span class="comment">/* ---- Internally used structures */</span>
<a name="l00040"></a>00040 
<a name="l00044"></a><a class="code" href="structt_color_r_g_b_a.html">00044</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> {
<a name="l00045"></a><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">00045</a>         Uint8 <a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>;
<a name="l00046"></a><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">00046</a>         Uint8 <a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>;
<a name="l00047"></a><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">00047</a>         Uint8 <a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>;
<a name="l00048"></a><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">00048</a>         Uint8 <a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>;
<a name="l00049"></a>00049 } <a class="code" href="_s_d_l2__rotozoom_8c.html#ac91ff95383d3a6c0df046a42e23baf04" title="A 32 bit RGBA pixel.">tColorRGBA</a>;
<a name="l00050"></a>00050 
<a name="l00054"></a><a class="code" href="structt_color_y.html">00054</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a> {
<a name="l00055"></a><a class="code" href="structt_color_y.html#ace61c93d341a0b154df0e9923558a537">00055</a>         Uint8 <a class="code" href="structt_color_y.html#ace61c93d341a0b154df0e9923558a537">y</a>;
<a name="l00056"></a>00056 } <a class="code" href="_s_d_l2__rotozoom_8c.html#a9db27e25d1a6e93c64eb768007dcf3da" title="A 8bit Y/palette pixel.">tColorY</a>;
<a name="l00057"></a>00057 
<a name="l00061"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f">00061</a> <span class="preprocessor">#define MAX(a,b)    (((a) &gt; (b)) ? (a) : (b))</span>
<a name="l00062"></a>00062 <span class="preprocessor"></span>
<a name="l00073"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb">00073</a> <span class="preprocessor">#define GUARD_ROWS (2)</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span>
<a name="l00078"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9">00078</a> <span class="preprocessor">#define VALUE_LIMIT     0.001</span>
<a name="l00079"></a>00079 <span class="preprocessor"></span>
<a name="l00083"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce">00083</a> Uint32 <a class="code" href="_s_d_l2__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(SDL_Surface *src)
<a name="l00084"></a>00084 {
<a name="l00085"></a>00085         Uint32 key = 0; 
<a name="l00086"></a>00086         SDL_GetColorKey(src, &amp;key);
<a name="l00087"></a>00087         <span class="keywordflow">return</span> key;
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 
<a name="l00090"></a>00090 
<a name="l00106"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512">00106</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512" title="Internal 32 bit integer-factor averaging Shrinker.">_shrinkSurfaceRGBA</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108         <span class="keywordtype">int</span> x, y, dx, dy, dgap, ra, ga, ba, aa;
<a name="l00109"></a>00109         <span class="keywordtype">int</span> n_average;
<a name="l00110"></a>00110         <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *sp, *osp, *oosp;
<a name="l00111"></a>00111         <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *dp;
<a name="l00112"></a>00112 
<a name="l00113"></a>00113         <span class="comment">/*</span>
<a name="l00114"></a>00114 <span class="comment">        * Averaging integer shrink</span>
<a name="l00115"></a>00115 <span class="comment">        */</span>
<a name="l00116"></a>00116 
<a name="l00117"></a>00117         <span class="comment">/* Precalculate division factor */</span>
<a name="l00118"></a>00118         n_average = factorx*factory;
<a name="l00119"></a>00119 
<a name="l00120"></a>00120         <span class="comment">/*</span>
<a name="l00121"></a>00121 <span class="comment">        * Scan destination</span>
<a name="l00122"></a>00122 <span class="comment">        */</span>
<a name="l00123"></a>00123         sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) src-&gt;pixels;
<a name="l00124"></a>00124         
<a name="l00125"></a>00125         dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) dst-&gt;pixels;
<a name="l00126"></a>00126         dgap = dst-&gt;pitch - dst-&gt;w * 4;
<a name="l00127"></a>00127 
<a name="l00128"></a>00128         <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00129"></a>00129 
<a name="l00130"></a>00130                 osp=sp;
<a name="l00131"></a>00131                 <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00132"></a>00132 
<a name="l00133"></a>00133                         <span class="comment">/* Trace out source box and accumulate */</span>
<a name="l00134"></a>00134                         oosp=sp;
<a name="l00135"></a>00135                         ra=ga=ba=aa=0;
<a name="l00136"></a>00136                         <span class="keywordflow">for</span> (dy=0; dy &lt; factory; dy++) {
<a name="l00137"></a>00137                                 <span class="keywordflow">for</span> (dx=0; dx &lt; factorx; dx++) {
<a name="l00138"></a>00138                                         ra += sp-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>;
<a name="l00139"></a>00139                                         ga += sp-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>;
<a name="l00140"></a>00140                                         ba += sp-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>;
<a name="l00141"></a>00141                                         aa += sp-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>;
<a name="l00142"></a>00142 
<a name="l00143"></a>00143                                         sp++;
<a name="l00144"></a>00144                                 } 
<a name="l00145"></a>00145                                 <span class="comment">/* src dx loop */</span>
<a name="l00146"></a>00146                                 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)((Uint8*)sp + (src-&gt;pitch - 4*factorx)); <span class="comment">// next y</span>
<a name="l00147"></a>00147                         }
<a name="l00148"></a>00148                         <span class="comment">/* src dy loop */</span>
<a name="l00149"></a>00149 
<a name="l00150"></a>00150                         <span class="comment">/* next box-x */</span>
<a name="l00151"></a>00151                         sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)((Uint8*)oosp + 4*factorx);
<a name="l00152"></a>00152 
<a name="l00153"></a>00153                         <span class="comment">/* Store result in destination */</span>
<a name="l00154"></a>00154                         dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = ra/n_average;
<a name="l00155"></a>00155                         dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = ga/n_average;
<a name="l00156"></a>00156                         dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = ba/n_average;
<a name="l00157"></a>00157                         dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = aa/n_average;
<a name="l00158"></a>00158 
<a name="l00159"></a>00159                         <span class="comment">/*</span>
<a name="l00160"></a>00160 <span class="comment">                        * Advance destination pointer </span>
<a name="l00161"></a>00161 <span class="comment">                        */</span>
<a name="l00162"></a>00162                         dp++;
<a name="l00163"></a>00163                 } 
<a name="l00164"></a>00164                 <span class="comment">/* dst x loop */</span>
<a name="l00165"></a>00165 
<a name="l00166"></a>00166                 <span class="comment">/* next box-y */</span>
<a name="l00167"></a>00167                 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)((Uint8*)osp + src-&gt;pitch*factory);
<a name="l00168"></a>00168 
<a name="l00169"></a>00169                 <span class="comment">/*</span>
<a name="l00170"></a>00170 <span class="comment">                * Advance destination pointers </span>
<a name="l00171"></a>00171 <span class="comment">                */</span>
<a name="l00172"></a>00172                 dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) dp + dgap);
<a name="l00173"></a>00173         } 
<a name="l00174"></a>00174         <span class="comment">/* dst y loop */</span>
<a name="l00175"></a>00175 
<a name="l00176"></a>00176         <span class="keywordflow">return</span> (0);
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178 
<a name="l00194"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be">00194</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be" title="Internal 8 bit integer-factor averaging shrinker.">_shrinkSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)
<a name="l00195"></a>00195 {
<a name="l00196"></a>00196         <span class="keywordtype">int</span> x, y, dx, dy, dgap, a;
<a name="l00197"></a>00197         <span class="keywordtype">int</span> n_average;
<a name="l00198"></a>00198         Uint8 *sp, *osp, *oosp;
<a name="l00199"></a>00199         Uint8 *dp;
<a name="l00200"></a>00200 
<a name="l00201"></a>00201         <span class="comment">/*</span>
<a name="l00202"></a>00202 <span class="comment">        * Averaging integer shrink</span>
<a name="l00203"></a>00203 <span class="comment">        */</span>
<a name="l00204"></a>00204 
<a name="l00205"></a>00205         <span class="comment">/* Precalculate division factor */</span>
<a name="l00206"></a>00206         n_average = factorx*factory;
<a name="l00207"></a>00207 
<a name="l00208"></a>00208         <span class="comment">/*</span>
<a name="l00209"></a>00209 <span class="comment">        * Scan destination</span>
<a name="l00210"></a>00210 <span class="comment">        */</span>
<a name="l00211"></a>00211         sp = (Uint8 *) src-&gt;pixels;
<a name="l00212"></a>00212 
<a name="l00213"></a>00213         dp = (Uint8 *) dst-&gt;pixels;
<a name="l00214"></a>00214         dgap = dst-&gt;pitch - dst-&gt;w;
<a name="l00215"></a>00215 
<a name="l00216"></a>00216         <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {    
<a name="l00217"></a>00217 
<a name="l00218"></a>00218                 osp=sp;
<a name="l00219"></a>00219                 <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00220"></a>00220 
<a name="l00221"></a>00221                         <span class="comment">/* Trace out source box and accumulate */</span>
<a name="l00222"></a>00222                         oosp=sp;
<a name="l00223"></a>00223                         a=0;
<a name="l00224"></a>00224                         <span class="keywordflow">for</span> (dy=0; dy &lt; factory; dy++) {
<a name="l00225"></a>00225                                 <span class="keywordflow">for</span> (dx=0; dx &lt; factorx; dx++) {
<a name="l00226"></a>00226                                         a += (*sp);
<a name="l00227"></a>00227                                         <span class="comment">/* next x */</span>           
<a name="l00228"></a>00228                                         sp++;
<a name="l00229"></a>00229                                 } 
<a name="l00230"></a>00230                                 <span class="comment">/* end src dx loop */</span>         
<a name="l00231"></a>00231                                 <span class="comment">/* next y */</span>
<a name="l00232"></a>00232                                 sp = (Uint8 *)((Uint8*)sp + (src-&gt;pitch - factorx)); 
<a name="l00233"></a>00233                         } 
<a name="l00234"></a>00234                         <span class="comment">/* end src dy loop */</span>
<a name="l00235"></a>00235 
<a name="l00236"></a>00236                         <span class="comment">/* next box-x */</span>
<a name="l00237"></a>00237                         sp = (Uint8 *)((Uint8*)oosp + factorx);
<a name="l00238"></a>00238 
<a name="l00239"></a>00239                         <span class="comment">/* Store result in destination */</span>
<a name="l00240"></a>00240                         *dp = a/n_average;
<a name="l00241"></a>00241 
<a name="l00242"></a>00242                         <span class="comment">/*</span>
<a name="l00243"></a>00243 <span class="comment">                        * Advance destination pointer </span>
<a name="l00244"></a>00244 <span class="comment">                        */</span>
<a name="l00245"></a>00245                         dp++;
<a name="l00246"></a>00246                 } 
<a name="l00247"></a>00247                 <span class="comment">/* end dst x loop */</span>
<a name="l00248"></a>00248 
<a name="l00249"></a>00249                 <span class="comment">/* next box-y */</span>
<a name="l00250"></a>00250                 sp = (Uint8 *)((Uint8*)osp + src-&gt;pitch*factory);
<a name="l00251"></a>00251 
<a name="l00252"></a>00252                 <span class="comment">/*</span>
<a name="l00253"></a>00253 <span class="comment">                * Advance destination pointers </span>
<a name="l00254"></a>00254 <span class="comment">                */</span>
<a name="l00255"></a>00255                 dp = (Uint8 *)((Uint8 *)dp + dgap);
<a name="l00256"></a>00256         } 
<a name="l00257"></a>00257         <span class="comment">/* end dst y loop */</span>
<a name="l00258"></a>00258 
<a name="l00259"></a>00259         <span class="keywordflow">return</span> (0);
<a name="l00260"></a>00260 }
<a name="l00261"></a>00261 
<a name="l00277"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81">00277</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81" title="Internal 32 bit Zoomer with optional anti-aliasing by bilinear interpolation.">_zoomSurfaceRGBA</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy, <span class="keywordtype">int</span> smooth)
<a name="l00278"></a>00278 {
<a name="l00279"></a>00279         <span class="keywordtype">int</span> x, y, sx, sy, ssx, ssy, *sax, *say, *csax, *csay, *salast, csx, csy, ex, ey, cx, cy, sstep, sstepx, sstepy;
<a name="l00280"></a>00280         <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *c00, *c01, *c10, *c11;
<a name="l00281"></a>00281         <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *sp, *csp, *dp;
<a name="l00282"></a>00282         <span class="keywordtype">int</span> spixelgap, spixelw, spixelh, dgap, t1, t2;
<a name="l00283"></a>00283 
<a name="l00284"></a>00284         <span class="comment">/*</span>
<a name="l00285"></a>00285 <span class="comment">        * Allocate memory for row/column increments </span>
<a name="l00286"></a>00286 <span class="comment">        */</span>
<a name="l00287"></a>00287         <span class="keywordflow">if</span> ((sax = (<span class="keywordtype">int</span> *) malloc((dst-&gt;w + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00288"></a>00288                 <span class="keywordflow">return</span> (-1);
<a name="l00289"></a>00289         }
<a name="l00290"></a>00290         <span class="keywordflow">if</span> ((say = (<span class="keywordtype">int</span> *) malloc((dst-&gt;h + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00291"></a>00291                 free(sax);
<a name="l00292"></a>00292                 <span class="keywordflow">return</span> (-1);
<a name="l00293"></a>00293         }
<a name="l00294"></a>00294 
<a name="l00295"></a>00295         <span class="comment">/*</span>
<a name="l00296"></a>00296 <span class="comment">        * Precalculate row increments </span>
<a name="l00297"></a>00297 <span class="comment">        */</span>
<a name="l00298"></a>00298         spixelw = (src-&gt;w - 1);
<a name="l00299"></a>00299         spixelh = (src-&gt;h - 1);
<a name="l00300"></a>00300         <span class="keywordflow">if</span> (smooth) {
<a name="l00301"></a>00301                 sx = (int) (65536.0 * (<span class="keywordtype">float</span>) spixelw / (float) (dst-&gt;w - 1));
<a name="l00302"></a>00302                 sy = (int) (65536.0 * (<span class="keywordtype">float</span>) spixelh / (float) (dst-&gt;h - 1));
<a name="l00303"></a>00303         } <span class="keywordflow">else</span> {
<a name="l00304"></a>00304                 sx = (int) (65536.0 * (<span class="keywordtype">float</span>) (src-&gt;w) / (<span class="keywordtype">float</span>) (dst-&gt;w));
<a name="l00305"></a>00305                 sy = (int) (65536.0 * (<span class="keywordtype">float</span>) (src-&gt;h) / (<span class="keywordtype">float</span>) (dst-&gt;h));
<a name="l00306"></a>00306         }
<a name="l00307"></a>00307 
<a name="l00308"></a>00308         <span class="comment">/* Maximum scaled source size */</span>
<a name="l00309"></a>00309         ssx = (src-&gt;w &lt;&lt; 16) - 1;
<a name="l00310"></a>00310         ssy = (src-&gt;h &lt;&lt; 16) - 1;
<a name="l00311"></a>00311 
<a name="l00312"></a>00312         <span class="comment">/* Precalculate horizontal row increments */</span>
<a name="l00313"></a>00313         csx = 0;
<a name="l00314"></a>00314         csax = sax;
<a name="l00315"></a>00315         <span class="keywordflow">for</span> (x = 0; x &lt;= dst-&gt;w; x++) {
<a name="l00316"></a>00316                 *csax = csx;
<a name="l00317"></a>00317                 csax++;
<a name="l00318"></a>00318                 csx += sx;
<a name="l00319"></a>00319 
<a name="l00320"></a>00320                 <span class="comment">/* Guard from overflows */</span>
<a name="l00321"></a>00321                 <span class="keywordflow">if</span> (csx &gt; ssx) { 
<a name="l00322"></a>00322                         csx = ssx; 
<a name="l00323"></a>00323                 }
<a name="l00324"></a>00324         }
<a name="l00325"></a>00325 
<a name="l00326"></a>00326         <span class="comment">/* Precalculate vertical row increments */</span>
<a name="l00327"></a>00327         csy = 0;
<a name="l00328"></a>00328         csay = say;
<a name="l00329"></a>00329         <span class="keywordflow">for</span> (y = 0; y &lt;= dst-&gt;h; y++) {
<a name="l00330"></a>00330                 *csay = csy;
<a name="l00331"></a>00331                 csay++;
<a name="l00332"></a>00332                 csy += sy;
<a name="l00333"></a>00333 
<a name="l00334"></a>00334                 <span class="comment">/* Guard from overflows */</span>
<a name="l00335"></a>00335                 <span class="keywordflow">if</span> (csy &gt; ssy) {
<a name="l00336"></a>00336                         csy = ssy;
<a name="l00337"></a>00337                 }
<a name="l00338"></a>00338         }
<a name="l00339"></a>00339 
<a name="l00340"></a>00340         sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) src-&gt;pixels;
<a name="l00341"></a>00341         dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) dst-&gt;pixels;
<a name="l00342"></a>00342         dgap = dst-&gt;pitch - dst-&gt;w * 4;
<a name="l00343"></a>00343         spixelgap = src-&gt;pitch/4;
<a name="l00344"></a>00344 
<a name="l00345"></a>00345         <span class="keywordflow">if</span> (flipx) sp += spixelw;
<a name="l00346"></a>00346         <span class="keywordflow">if</span> (flipy) sp += (spixelgap * spixelh);
<a name="l00347"></a>00347 
<a name="l00348"></a>00348         <span class="comment">/*</span>
<a name="l00349"></a>00349 <span class="comment">        * Switch between interpolating and non-interpolating code </span>
<a name="l00350"></a>00350 <span class="comment">        */</span>
<a name="l00351"></a>00351         <span class="keywordflow">if</span> (smooth) {
<a name="l00352"></a>00352 
<a name="l00353"></a>00353                 <span class="comment">/*</span>
<a name="l00354"></a>00354 <span class="comment">                * Interpolating Zoom </span>
<a name="l00355"></a>00355 <span class="comment">                */</span>
<a name="l00356"></a>00356                 csay = say;
<a name="l00357"></a>00357                 <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00358"></a>00358                         csp = sp;
<a name="l00359"></a>00359                         csax = sax;
<a name="l00360"></a>00360                         <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00361"></a>00361                                 <span class="comment">/*</span>
<a name="l00362"></a>00362 <span class="comment">                                * Setup color source pointers </span>
<a name="l00363"></a>00363 <span class="comment">                                */</span>
<a name="l00364"></a>00364                                 ex = (*csax &amp; 0xffff);
<a name="l00365"></a>00365                                 ey = (*csay &amp; 0xffff);
<a name="l00366"></a>00366                                 cx = (*csax &gt;&gt; 16);
<a name="l00367"></a>00367                                 cy = (*csay &gt;&gt; 16);
<a name="l00368"></a>00368                                 sstepx = cx &lt; spixelw;
<a name="l00369"></a>00369                                 sstepy = cy &lt; spixelh;
<a name="l00370"></a>00370                                 c00 = sp;
<a name="l00371"></a>00371                                 c01 = sp;
<a name="l00372"></a>00372                                 c10 = sp;
<a name="l00373"></a>00373                                 <span class="keywordflow">if</span> (sstepy) {
<a name="l00374"></a>00374                                         <span class="keywordflow">if</span> (flipy) {
<a name="l00375"></a>00375                                                 c10 -= spixelgap;
<a name="l00376"></a>00376                                         } <span class="keywordflow">else</span> {
<a name="l00377"></a>00377                                                 c10 += spixelgap;
<a name="l00378"></a>00378                                         }
<a name="l00379"></a>00379                                 }
<a name="l00380"></a>00380                                 c11 = c10;
<a name="l00381"></a>00381                                 <span class="keywordflow">if</span> (sstepx) {
<a name="l00382"></a>00382                                         <span class="keywordflow">if</span> (flipx) {
<a name="l00383"></a>00383                                                 c01--;
<a name="l00384"></a>00384                                                 c11--;
<a name="l00385"></a>00385                                         } <span class="keywordflow">else</span> {
<a name="l00386"></a>00386                                                 c01++;
<a name="l00387"></a>00387                                                 c11++;
<a name="l00388"></a>00388                                         }
<a name="l00389"></a>00389                                 }
<a name="l00390"></a>00390 
<a name="l00391"></a>00391                                 <span class="comment">/*</span>
<a name="l00392"></a>00392 <span class="comment">                                * Draw and interpolate colors </span>
<a name="l00393"></a>00393 <span class="comment">                                */</span>
<a name="l00394"></a>00394                                 t1 = ((((c01-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) &gt;&gt; 16) + c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) &amp; 0xff;
<a name="l00395"></a>00395                                 t2 = ((((c11-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) &gt;&gt; 16) + c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) &amp; 0xff;
<a name="l00396"></a>00396                                 dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;
<a name="l00397"></a>00397                                 t1 = ((((c01-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) &gt;&gt; 16) + c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) &amp; 0xff;
<a name="l00398"></a>00398                                 t2 = ((((c11-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) &gt;&gt; 16) + c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) &amp; 0xff;
<a name="l00399"></a>00399                                 dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;
<a name="l00400"></a>00400                                 t1 = ((((c01-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) &gt;&gt; 16) + c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) &amp; 0xff;
<a name="l00401"></a>00401                                 t2 = ((((c11-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) &gt;&gt; 16) + c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) &amp; 0xff;
<a name="l00402"></a>00402                                 dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;
<a name="l00403"></a>00403                                 t1 = ((((c01-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) &gt;&gt; 16) + c00-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) &amp; 0xff;
<a name="l00404"></a>00404                                 t2 = ((((c11-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) &gt;&gt; 16) + c10-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) &amp; 0xff;
<a name="l00405"></a>00405                                 dp-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;                          
<a name="l00406"></a>00406                                 <span class="comment">/*</span>
<a name="l00407"></a>00407 <span class="comment">                                * Advance source pointer x</span>
<a name="l00408"></a>00408 <span class="comment">                                */</span>
<a name="l00409"></a>00409                                 salast = csax;
<a name="l00410"></a>00410                                 csax++;                         
<a name="l00411"></a>00411                                 sstep = (*csax &gt;&gt; 16) - (*salast &gt;&gt; 16);
<a name="l00412"></a>00412                                 <span class="keywordflow">if</span> (flipx) {
<a name="l00413"></a>00413                                         sp -= sstep;
<a name="l00414"></a>00414                                 } <span class="keywordflow">else</span> {
<a name="l00415"></a>00415                                         sp += sstep;
<a name="l00416"></a>00416                                 }
<a name="l00417"></a>00417 
<a name="l00418"></a>00418                                 <span class="comment">/*</span>
<a name="l00419"></a>00419 <span class="comment">                                * Advance destination pointer x</span>
<a name="l00420"></a>00420 <span class="comment">                                */</span>
<a name="l00421"></a>00421                                 dp++;
<a name="l00422"></a>00422                         }
<a name="l00423"></a>00423                         <span class="comment">/*</span>
<a name="l00424"></a>00424 <span class="comment">                        * Advance source pointer y</span>
<a name="l00425"></a>00425 <span class="comment">                        */</span>
<a name="l00426"></a>00426                         salast = csay;
<a name="l00427"></a>00427                         csay++;
<a name="l00428"></a>00428                         sstep = (*csay &gt;&gt; 16) - (*salast &gt;&gt; 16);
<a name="l00429"></a>00429                         sstep *= spixelgap;
<a name="l00430"></a>00430                         <span class="keywordflow">if</span> (flipy) { 
<a name="l00431"></a>00431                                 sp = csp - sstep;
<a name="l00432"></a>00432                         } <span class="keywordflow">else</span> {
<a name="l00433"></a>00433                                 sp = csp + sstep;
<a name="l00434"></a>00434                         }
<a name="l00435"></a>00435 
<a name="l00436"></a>00436                         <span class="comment">/*</span>
<a name="l00437"></a>00437 <span class="comment">                        * Advance destination pointer y</span>
<a name="l00438"></a>00438 <span class="comment">                        */</span>
<a name="l00439"></a>00439                         dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) dp + dgap);
<a name="l00440"></a>00440                 }
<a name="l00441"></a>00441         } <span class="keywordflow">else</span> {
<a name="l00442"></a>00442                 <span class="comment">/*</span>
<a name="l00443"></a>00443 <span class="comment">                * Non-Interpolating Zoom </span>
<a name="l00444"></a>00444 <span class="comment">                */</span>              
<a name="l00445"></a>00445                 csay = say;
<a name="l00446"></a>00446                 <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00447"></a>00447                         csp = sp;
<a name="l00448"></a>00448                         csax = sax;
<a name="l00449"></a>00449                         <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00450"></a>00450                                 <span class="comment">/*</span>
<a name="l00451"></a>00451 <span class="comment">                                * Draw </span>
<a name="l00452"></a>00452 <span class="comment">                                */</span>
<a name="l00453"></a>00453                                 *dp = *sp;
<a name="l00454"></a>00454 
<a name="l00455"></a>00455                                 <span class="comment">/*</span>
<a name="l00456"></a>00456 <span class="comment">                                * Advance source pointer x</span>
<a name="l00457"></a>00457 <span class="comment">                                */</span>
<a name="l00458"></a>00458                                 salast = csax;
<a name="l00459"></a>00459                                 csax++;                         
<a name="l00460"></a>00460                                 sstep = (*csax &gt;&gt; 16) - (*salast &gt;&gt; 16);
<a name="l00461"></a>00461                                 <span class="keywordflow">if</span> (flipx) sstep = -sstep;
<a name="l00462"></a>00462                                 sp += sstep;
<a name="l00463"></a>00463 
<a name="l00464"></a>00464                                 <span class="comment">/*</span>
<a name="l00465"></a>00465 <span class="comment">                                * Advance destination pointer x</span>
<a name="l00466"></a>00466 <span class="comment">                                */</span>
<a name="l00467"></a>00467                                 dp++;
<a name="l00468"></a>00468                         }
<a name="l00469"></a>00469                         <span class="comment">/*</span>
<a name="l00470"></a>00470 <span class="comment">                        * Advance source pointer y</span>
<a name="l00471"></a>00471 <span class="comment">                        */</span>
<a name="l00472"></a>00472                         salast = csay;
<a name="l00473"></a>00473                         csay++;
<a name="l00474"></a>00474                         sstep = (*csay &gt;&gt; 16) - (*salast &gt;&gt; 16);
<a name="l00475"></a>00475                         sstep *= spixelgap;
<a name="l00476"></a>00476                         <span class="keywordflow">if</span> (flipy) sstep = -sstep;                      
<a name="l00477"></a>00477                         sp = csp + sstep;
<a name="l00478"></a>00478 
<a name="l00479"></a>00479                         <span class="comment">/*</span>
<a name="l00480"></a>00480 <span class="comment">                        * Advance destination pointer y</span>
<a name="l00481"></a>00481 <span class="comment">                        */</span>
<a name="l00482"></a>00482                         dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) dp + dgap);
<a name="l00483"></a>00483                 }
<a name="l00484"></a>00484         }
<a name="l00485"></a>00485 
<a name="l00486"></a>00486         <span class="comment">/*</span>
<a name="l00487"></a>00487 <span class="comment">        * Remove temp arrays </span>
<a name="l00488"></a>00488 <span class="comment">        */</span>
<a name="l00489"></a>00489         free(sax);
<a name="l00490"></a>00490         free(say);
<a name="l00491"></a>00491 
<a name="l00492"></a>00492         <span class="keywordflow">return</span> (0);
<a name="l00493"></a>00493 }
<a name="l00494"></a>00494 
<a name="l00510"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29">00510</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29" title="Internal 8 bit Zoomer without smoothing.">_zoomSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy)
<a name="l00511"></a>00511 {
<a name="l00512"></a>00512         <span class="keywordtype">int</span> x, y;
<a name="l00513"></a>00513         Uint32 *sax, *say, *csax, *csay;
<a name="l00514"></a>00514         <span class="keywordtype">int</span> csx, csy;
<a name="l00515"></a>00515         Uint8 *sp, *dp, *csp;
<a name="l00516"></a>00516         <span class="keywordtype">int</span> dgap;
<a name="l00517"></a>00517 
<a name="l00518"></a>00518         <span class="comment">/*</span>
<a name="l00519"></a>00519 <span class="comment">        * Allocate memory for row increments </span>
<a name="l00520"></a>00520 <span class="comment">        */</span>
<a name="l00521"></a>00521         <span class="keywordflow">if</span> ((sax = (Uint32 *) malloc((dst-&gt;w + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00522"></a>00522                 <span class="keywordflow">return</span> (-1);
<a name="l00523"></a>00523         }
<a name="l00524"></a>00524         <span class="keywordflow">if</span> ((say = (Uint32 *) malloc((dst-&gt;h + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00525"></a>00525                 free(sax);
<a name="l00526"></a>00526                 <span class="keywordflow">return</span> (-1);
<a name="l00527"></a>00527         }
<a name="l00528"></a>00528 
<a name="l00529"></a>00529         <span class="comment">/*</span>
<a name="l00530"></a>00530 <span class="comment">        * Pointer setup </span>
<a name="l00531"></a>00531 <span class="comment">        */</span>
<a name="l00532"></a>00532         sp = csp = (Uint8 *) src-&gt;pixels;
<a name="l00533"></a>00533         dp = (Uint8 *) dst-&gt;pixels;
<a name="l00534"></a>00534         dgap = dst-&gt;pitch - dst-&gt;w;
<a name="l00535"></a>00535 
<a name="l00536"></a>00536         <span class="keywordflow">if</span> (flipx) csp += (src-&gt;w-1);
<a name="l00537"></a>00537         <span class="keywordflow">if</span> (flipy) csp  = ( (Uint8*)csp + src-&gt;pitch*(src-&gt;h-1) );
<a name="l00538"></a>00538 
<a name="l00539"></a>00539         <span class="comment">/*</span>
<a name="l00540"></a>00540 <span class="comment">        * Precalculate row increments </span>
<a name="l00541"></a>00541 <span class="comment">        */</span>
<a name="l00542"></a>00542         csx = 0;
<a name="l00543"></a>00543         csax = sax;
<a name="l00544"></a>00544         <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00545"></a>00545                 csx += src-&gt;w;
<a name="l00546"></a>00546                 *csax = 0;
<a name="l00547"></a>00547                 <span class="keywordflow">while</span> (csx &gt;= dst-&gt;w) {
<a name="l00548"></a>00548                         csx -= dst-&gt;w;
<a name="l00549"></a>00549                         (*csax)++;
<a name="l00550"></a>00550                 }
<a name="l00551"></a>00551                 (*csax) = (*csax) * (flipx ? -1 : 1);
<a name="l00552"></a>00552                 csax++;
<a name="l00553"></a>00553         }
<a name="l00554"></a>00554         csy = 0;
<a name="l00555"></a>00555         csay = say;
<a name="l00556"></a>00556         <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00557"></a>00557                 csy += src-&gt;h;
<a name="l00558"></a>00558                 *csay = 0;
<a name="l00559"></a>00559                 <span class="keywordflow">while</span> (csy &gt;= dst-&gt;h) {
<a name="l00560"></a>00560                         csy -= dst-&gt;h;
<a name="l00561"></a>00561                         (*csay)++;
<a name="l00562"></a>00562                 }
<a name="l00563"></a>00563                 (*csay) = (*csay) * (flipy ? -1 : 1);
<a name="l00564"></a>00564                 csay++;
<a name="l00565"></a>00565         }
<a name="l00566"></a>00566 
<a name="l00567"></a>00567         <span class="comment">/*</span>
<a name="l00568"></a>00568 <span class="comment">        * Draw </span>
<a name="l00569"></a>00569 <span class="comment">        */</span>
<a name="l00570"></a>00570         csay = say;
<a name="l00571"></a>00571         <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00572"></a>00572                 csax = sax;
<a name="l00573"></a>00573                 sp = csp;
<a name="l00574"></a>00574                 <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00575"></a>00575                         <span class="comment">/*</span>
<a name="l00576"></a>00576 <span class="comment">                        * Draw </span>
<a name="l00577"></a>00577 <span class="comment">                        */</span>
<a name="l00578"></a>00578                         *dp = *sp;
<a name="l00579"></a>00579                         <span class="comment">/*</span>
<a name="l00580"></a>00580 <span class="comment">                        * Advance source pointers </span>
<a name="l00581"></a>00581 <span class="comment">                        */</span>
<a name="l00582"></a>00582                         sp += (*csax);
<a name="l00583"></a>00583                         csax++;
<a name="l00584"></a>00584                         <span class="comment">/*</span>
<a name="l00585"></a>00585 <span class="comment">                        * Advance destination pointer </span>
<a name="l00586"></a>00586 <span class="comment">                        */</span>
<a name="l00587"></a>00587                         dp++;
<a name="l00588"></a>00588                 }
<a name="l00589"></a>00589                 <span class="comment">/*</span>
<a name="l00590"></a>00590 <span class="comment">                * Advance source pointer (for row) </span>
<a name="l00591"></a>00591 <span class="comment">                */</span>
<a name="l00592"></a>00592                 csp += ((*csay) * src-&gt;pitch);
<a name="l00593"></a>00593                 csay++;
<a name="l00594"></a>00594 
<a name="l00595"></a>00595                 <span class="comment">/*</span>
<a name="l00596"></a>00596 <span class="comment">                * Advance destination pointers </span>
<a name="l00597"></a>00597 <span class="comment">                */</span>
<a name="l00598"></a>00598                 dp += dgap;
<a name="l00599"></a>00599         }
<a name="l00600"></a>00600 
<a name="l00601"></a>00601         <span class="comment">/*</span>
<a name="l00602"></a>00602 <span class="comment">        * Remove temp arrays </span>
<a name="l00603"></a>00603 <span class="comment">        */</span>
<a name="l00604"></a>00604         free(sax);
<a name="l00605"></a>00605         free(say);
<a name="l00606"></a>00606 
<a name="l00607"></a>00607         <span class="keywordflow">return</span> (0);
<a name="l00608"></a>00608 }
<a name="l00609"></a>00609 
<a name="l00629"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7">00629</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7" title="Internal 32 bit rotozoomer with optional anti-aliasing.">_transformSurfaceRGBA</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> cx, <span class="keywordtype">int</span> cy, <span class="keywordtype">int</span> isin, <span class="keywordtype">int</span> icos, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy, <span class="keywordtype">int</span> smooth)
<a name="l00630"></a>00630 {
<a name="l00631"></a>00631         <span class="keywordtype">int</span> x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
<a name="l00632"></a>00632         <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> c00, c01, c10, c11, cswap;
<a name="l00633"></a>00633         <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *pc, *sp;
<a name="l00634"></a>00634         <span class="keywordtype">int</span> gap;
<a name="l00635"></a>00635 
<a name="l00636"></a>00636         <span class="comment">/*</span>
<a name="l00637"></a>00637 <span class="comment">        * Variable setup </span>
<a name="l00638"></a>00638 <span class="comment">        */</span>
<a name="l00639"></a>00639         xd = ((src-&gt;w - dst-&gt;w) &lt;&lt; 15);
<a name="l00640"></a>00640         yd = ((src-&gt;h - dst-&gt;h) &lt;&lt; 15);
<a name="l00641"></a>00641         ax = (cx &lt;&lt; 16) - (icos * cx);
<a name="l00642"></a>00642         ay = (cy &lt;&lt; 16) - (isin * cx);
<a name="l00643"></a>00643         sw = src-&gt;w - 1;
<a name="l00644"></a>00644         sh = src-&gt;h - 1;
<a name="l00645"></a>00645         pc = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a>*) dst-&gt;pixels;
<a name="l00646"></a>00646         gap = dst-&gt;pitch - dst-&gt;w * 4;
<a name="l00647"></a>00647 
<a name="l00648"></a>00648         <span class="comment">/*</span>
<a name="l00649"></a>00649 <span class="comment">        * Switch between interpolating and non-interpolating code </span>
<a name="l00650"></a>00650 <span class="comment">        */</span>
<a name="l00651"></a>00651         if (smooth) {
<a name="l00652"></a>00652                 <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00653"></a>00653                         dy = cy - y;
<a name="l00654"></a>00654                         sdx = (ax + (isin * dy)) + xd;
<a name="l00655"></a>00655                         sdy = (ay - (icos * dy)) + yd;
<a name="l00656"></a>00656                         <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00657"></a>00657                                 dx = (sdx &gt;&gt; 16);
<a name="l00658"></a>00658                                 dy = (sdy &gt;&gt; 16);
<a name="l00659"></a>00659                                 <span class="keywordflow">if</span> (flipx) dx = sw - dx;
<a name="l00660"></a>00660                                 <span class="keywordflow">if</span> (flipy) dy = sh - dy;
<a name="l00661"></a>00661                                 <span class="keywordflow">if</span> ((dx &gt; -1) &amp;&amp; (dy &gt; -1) &amp;&amp; (dx &lt; (src-&gt;w-1)) &amp;&amp; (dy &lt; (src-&gt;h-1))) {
<a name="l00662"></a>00662                                         sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)src-&gt;pixels;;
<a name="l00663"></a>00663                                         sp += ((src-&gt;pitch/4) * dy);
<a name="l00664"></a>00664                                         sp += dx;
<a name="l00665"></a>00665                                         c00 = *sp;
<a name="l00666"></a>00666                                         sp += 1;
<a name="l00667"></a>00667                                         c01 = *sp;
<a name="l00668"></a>00668                                         sp += (src-&gt;pitch/4);
<a name="l00669"></a>00669                                         c11 = *sp;
<a name="l00670"></a>00670                                         sp -= 1;
<a name="l00671"></a>00671                                         c10 = *sp;
<a name="l00672"></a>00672                                         <span class="keywordflow">if</span> (flipx) {
<a name="l00673"></a>00673                                                 cswap = c00; c00=c01; c01=cswap;
<a name="l00674"></a>00674                                                 cswap = c10; c10=c11; c11=cswap;
<a name="l00675"></a>00675                                         }
<a name="l00676"></a>00676                                         <span class="keywordflow">if</span> (flipy) {
<a name="l00677"></a>00677                                                 cswap = c00; c00=c10; c10=cswap;
<a name="l00678"></a>00678                                                 cswap = c01; c01=c11; c11=cswap;
<a name="l00679"></a>00679                                         }
<a name="l00680"></a>00680                                         <span class="comment">/*</span>
<a name="l00681"></a>00681 <span class="comment">                                        * Interpolate colors </span>
<a name="l00682"></a>00682 <span class="comment">                                        */</span>
<a name="l00683"></a>00683                                         ex = (sdx &amp; 0xffff);
<a name="l00684"></a>00684                                         ey = (sdy &amp; 0xffff);
<a name="l00685"></a>00685                                         t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) &gt;&gt; 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) &amp; 0xff;
<a name="l00686"></a>00686                                         t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) &gt;&gt; 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) &amp; 0xff;
<a name="l00687"></a>00687                                         pc-&gt;<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;
<a name="l00688"></a>00688                                         t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) &gt;&gt; 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) &amp; 0xff;
<a name="l00689"></a>00689                                         t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) &gt;&gt; 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) &amp; 0xff;
<a name="l00690"></a>00690                                         pc-&gt;<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;
<a name="l00691"></a>00691                                         t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) &gt;&gt; 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) &amp; 0xff;
<a name="l00692"></a>00692                                         t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) &gt;&gt; 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) &amp; 0xff;
<a name="l00693"></a>00693                                         pc-&gt;<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;
<a name="l00694"></a>00694                                         t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) &gt;&gt; 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) &amp; 0xff;
<a name="l00695"></a>00695                                         t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) &gt;&gt; 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) &amp; 0xff;
<a name="l00696"></a>00696                                         pc-&gt;<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = (((t2 - t1) * ey) &gt;&gt; 16) + t1;
<a name="l00697"></a>00697                                 }
<a name="l00698"></a>00698                                 sdx += icos;
<a name="l00699"></a>00699                                 sdy += isin;
<a name="l00700"></a>00700                                 pc++;
<a name="l00701"></a>00701                         }
<a name="l00702"></a>00702                         pc = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) pc + gap);
<a name="l00703"></a>00703                 }
<a name="l00704"></a>00704         } <span class="keywordflow">else</span> {
<a name="l00705"></a>00705                 <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00706"></a>00706                         dy = cy - y;
<a name="l00707"></a>00707                         sdx = (ax + (isin * dy)) + xd;
<a name="l00708"></a>00708                         sdy = (ay - (icos * dy)) + yd;
<a name="l00709"></a>00709                         <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00710"></a>00710                                 dx = (short) (sdx &gt;&gt; 16);
<a name="l00711"></a>00711                                 dy = (short) (sdy &gt;&gt; 16);
<a name="l00712"></a>00712                                 <span class="keywordflow">if</span> (flipx) dx = (src-&gt;w-1)-dx;
<a name="l00713"></a>00713                                 <span class="keywordflow">if</span> (flipy) dy = (src-&gt;h-1)-dy;
<a name="l00714"></a>00714                                 <span class="keywordflow">if</span> ((dx &gt;= 0) &amp;&amp; (dy &gt;= 0) &amp;&amp; (dx &lt; src-&gt;w) &amp;&amp; (dy &lt; src-&gt;h)) {
<a name="l00715"></a>00715                                         sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) src-&gt;pixels + src-&gt;pitch * dy);
<a name="l00716"></a>00716                                         sp += dx;
<a name="l00717"></a>00717                                         *pc = *sp;
<a name="l00718"></a>00718                                 }
<a name="l00719"></a>00719                                 sdx += icos;
<a name="l00720"></a>00720                                 sdy += isin;
<a name="l00721"></a>00721                                 pc++;
<a name="l00722"></a>00722                         }
<a name="l00723"></a>00723                         pc = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) pc + gap);
<a name="l00724"></a>00724                 }
<a name="l00725"></a>00725         }
<a name="l00726"></a>00726 }
<a name="l00727"></a>00727 
<a name="l00746"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c">00746</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c" title="Rotates and zooms 8 bit palette/Y &#39;src&#39; surface to &#39;dst&#39; surface without smoothing.">transformSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> cx, <span class="keywordtype">int</span> cy, <span class="keywordtype">int</span> isin, <span class="keywordtype">int</span> icos, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy)
<a name="l00747"></a>00747 {
<a name="l00748"></a>00748         <span class="keywordtype">int</span> x, y, dx, dy, xd, yd, sdx, sdy, ax, ay;
<a name="l00749"></a>00749         <a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a> *pc, *sp;
<a name="l00750"></a>00750         <span class="keywordtype">int</span> gap;
<a name="l00751"></a>00751 
<a name="l00752"></a>00752         <span class="comment">/*</span>
<a name="l00753"></a>00753 <span class="comment">        * Variable setup </span>
<a name="l00754"></a>00754 <span class="comment">        */</span>
<a name="l00755"></a>00755         xd = ((src-&gt;w - dst-&gt;w) &lt;&lt; 15);
<a name="l00756"></a>00756         yd = ((src-&gt;h - dst-&gt;h) &lt;&lt; 15);
<a name="l00757"></a>00757         ax = (cx &lt;&lt; 16) - (icos * cx);
<a name="l00758"></a>00758         ay = (cy &lt;&lt; 16) - (isin * cx);
<a name="l00759"></a>00759         pc = (<a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a>*) dst-&gt;pixels;
<a name="l00760"></a>00760         gap = dst-&gt;pitch - dst-&gt;w;
<a name="l00761"></a>00761         <span class="comment">/*</span>
<a name="l00762"></a>00762 <span class="comment">        * Clear surface to colorkey </span>
<a name="l00763"></a>00763 <span class="comment">        */</span>      
<a name="l00764"></a>00764         memset(pc, (<span class="keywordtype">int</span>)(<a class="code" href="_s_d_l2__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(src) &amp; 0xff), dst-&gt;pitch * dst-&gt;h);
<a name="l00765"></a>00765         <span class="comment">/*</span>
<a name="l00766"></a>00766 <span class="comment">        * Iterate through destination surface </span>
<a name="l00767"></a>00767 <span class="comment">        */</span>
<a name="l00768"></a>00768         <span class="keywordflow">for</span> (y = 0; y &lt; dst-&gt;h; y++) {
<a name="l00769"></a>00769                 dy = cy - y;
<a name="l00770"></a>00770                 sdx = (ax + (isin * dy)) + xd;
<a name="l00771"></a>00771                 sdy = (ay - (icos * dy)) + yd;
<a name="l00772"></a>00772                 <span class="keywordflow">for</span> (x = 0; x &lt; dst-&gt;w; x++) {
<a name="l00773"></a>00773                         dx = (short) (sdx &gt;&gt; 16);
<a name="l00774"></a>00774                         dy = (short) (sdy &gt;&gt; 16);
<a name="l00775"></a>00775                         <span class="keywordflow">if</span> (flipx) dx = (src-&gt;w-1)-dx;
<a name="l00776"></a>00776                         <span class="keywordflow">if</span> (flipy) dy = (src-&gt;h-1)-dy;
<a name="l00777"></a>00777                         <span class="keywordflow">if</span> ((dx &gt;= 0) &amp;&amp; (dy &gt;= 0) &amp;&amp; (dx &lt; src-&gt;w) &amp;&amp; (dy &lt; src-&gt;h)) {
<a name="l00778"></a>00778                                 sp = (<a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a> *) (src-&gt;pixels);
<a name="l00779"></a>00779                                 sp += (src-&gt;pitch * dy + dx);
<a name="l00780"></a>00780                                 *pc = *sp;
<a name="l00781"></a>00781                         }
<a name="l00782"></a>00782                         sdx += icos;
<a name="l00783"></a>00783                         sdy += isin;
<a name="l00784"></a>00784                         pc++;
<a name="l00785"></a>00785                 }
<a name="l00786"></a>00786                 pc += gap;
<a name="l00787"></a>00787         }
<a name="l00788"></a>00788 }
<a name="l00789"></a>00789 
<a name="l00803"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#ac2858dec47549c8f82360568b5a29363">00803</a> SDL_Surface* <a class="code" href="_s_d_l2__rotozoom_8c.html#a77563d68634cb2624d4f2f0bcdc19e73" title="Rotates a 8/16/24/32 bit surface in increments of 90 degrees.">rotateSurface90Degrees</a>(SDL_Surface* src, <span class="keywordtype">int</span> numClockwiseTurns) 
<a name="l00804"></a>00804 {
<a name="l00805"></a>00805         <span class="keywordtype">int</span> row, col, newWidth, newHeight;
<a name="l00806"></a>00806         <span class="keywordtype">int</span> bpp, bpr;
<a name="l00807"></a>00807         SDL_Surface* dst;
<a name="l00808"></a>00808         Uint8* srcBuf;
<a name="l00809"></a>00809         Uint8* dstBuf;
<a name="l00810"></a>00810         <span class="keywordtype">int</span> normalizedClockwiseTurns;
<a name="l00811"></a>00811 
<a name="l00812"></a>00812         <span class="comment">/* Has to be a valid surface pointer and be a Nbit surface where n is divisible by 8 */</span>
<a name="l00813"></a>00813         <span class="keywordflow">if</span> (!src || 
<a name="l00814"></a>00814             !src-&gt;format) {
<a name="l00815"></a>00815                 SDL_SetError(<span class="stringliteral">&quot;NULL source surface or source surface format&quot;</span>);
<a name="l00816"></a>00816             <span class="keywordflow">return</span> NULL; 
<a name="l00817"></a>00817         }
<a name="l00818"></a>00818 
<a name="l00819"></a>00819         <span class="keywordflow">if</span> ((src-&gt;format-&gt;BitsPerPixel % 8) != 0) {
<a name="l00820"></a>00820                 SDL_SetError(<span class="stringliteral">&quot;Invalid source surface bit depth&quot;</span>);
<a name="l00821"></a>00821             <span class="keywordflow">return</span> NULL; 
<a name="l00822"></a>00822         }
<a name="l00823"></a>00823 
<a name="l00824"></a>00824         <span class="comment">/* normalize numClockwiseTurns */</span>
<a name="l00825"></a>00825         normalizedClockwiseTurns = (numClockwiseTurns % 4);
<a name="l00826"></a>00826         <span class="keywordflow">if</span> (normalizedClockwiseTurns &lt; 0) {
<a name="l00827"></a>00827                 normalizedClockwiseTurns += 4;
<a name="l00828"></a>00828         }
<a name="l00829"></a>00829 
<a name="l00830"></a>00830         <span class="comment">/* If turns are even, our new width/height will be the same as the source surface */</span>
<a name="l00831"></a>00831         <span class="keywordflow">if</span> (normalizedClockwiseTurns % 2) {
<a name="l00832"></a>00832                 newWidth = src-&gt;h;
<a name="l00833"></a>00833                 newHeight = src-&gt;w;
<a name="l00834"></a>00834         } <span class="keywordflow">else</span> {
<a name="l00835"></a>00835                 newWidth = src-&gt;w;
<a name="l00836"></a>00836                 newHeight = src-&gt;h;
<a name="l00837"></a>00837         }
<a name="l00838"></a>00838 
<a name="l00839"></a>00839         dst = SDL_CreateRGBSurface( src-&gt;flags, newWidth, newHeight, src-&gt;format-&gt;BitsPerPixel,
<a name="l00840"></a>00840                 src-&gt;format-&gt;Rmask,
<a name="l00841"></a>00841                 src-&gt;format-&gt;Gmask, 
<a name="l00842"></a>00842                 src-&gt;format-&gt;Bmask, 
<a name="l00843"></a>00843                 src-&gt;format-&gt;Amask);
<a name="l00844"></a>00844         <span class="keywordflow">if</span>(!dst) {
<a name="l00845"></a>00845                 SDL_SetError(<span class="stringliteral">&quot;Could not create destination surface&quot;</span>); 
<a name="l00846"></a>00846                 <span class="keywordflow">return</span> NULL;
<a name="l00847"></a>00847         }
<a name="l00848"></a>00848 
<a name="l00849"></a>00849         <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {
<a name="l00850"></a>00850                 SDL_LockSurface(src);
<a name="l00851"></a>00851         }
<a name="l00852"></a>00852         <span class="keywordflow">if</span> (SDL_MUSTLOCK(dst)) {
<a name="l00853"></a>00853                 SDL_LockSurface(dst);
<a name="l00854"></a>00854         }
<a name="l00855"></a>00855 
<a name="l00856"></a>00856         <span class="comment">/* Calculate byte-per-pixel */</span>
<a name="l00857"></a>00857         bpp = src-&gt;format-&gt;BitsPerPixel / 8;
<a name="l00858"></a>00858 
<a name="l00859"></a>00859         <span class="keywordflow">switch</span>(normalizedClockwiseTurns) {
<a name="l00860"></a>00860         <span class="keywordflow">case</span> 0: <span class="comment">/* Make a copy of the surface */</span>
<a name="l00861"></a>00861                 {
<a name="l00862"></a>00862                         <span class="comment">/* Unfortunately SDL_BlitSurface cannot be used to make a copy of the surface</span>
<a name="l00863"></a>00863 <span class="comment">                        since it does not preserve alpha. */</span>
<a name="l00864"></a>00864 
<a name="l00865"></a>00865                         <span class="keywordflow">if</span> (src-&gt;pitch == dst-&gt;pitch) {
<a name="l00866"></a>00866                                 <span class="comment">/* If the pitch is the same for both surfaces, the memory can be copied all at once. */</span>
<a name="l00867"></a>00867                                 memcpy(dst-&gt;pixels, src-&gt;pixels, (src-&gt;h * src-&gt;pitch));
<a name="l00868"></a>00868                         }
<a name="l00869"></a>00869                         <span class="keywordflow">else</span>
<a name="l00870"></a>00870                         {
<a name="l00871"></a>00871                                 <span class="comment">/* If the pitch differs, copy each row separately */</span>
<a name="l00872"></a>00872                                 srcBuf = (Uint8*)(src-&gt;pixels);
<a name="l00873"></a>00873                                 dstBuf = (Uint8*)(dst-&gt;pixels);
<a name="l00874"></a>00874                                 bpr = src-&gt;w * bpp;
<a name="l00875"></a>00875                                 <span class="keywordflow">for</span> (row = 0; row &lt; src-&gt;h; row++) {
<a name="l00876"></a>00876                                         memcpy(dstBuf, srcBuf, bpr);
<a name="l00877"></a>00877                                         srcBuf += src-&gt;pitch;
<a name="l00878"></a>00878                                         dstBuf += dst-&gt;pitch;
<a name="l00879"></a>00879                                 }
<a name="l00880"></a>00880                         }
<a name="l00881"></a>00881                 }
<a name="l00882"></a>00882                 <span class="keywordflow">break</span>;
<a name="l00883"></a>00883 
<a name="l00884"></a>00884                 <span class="comment">/* rotate clockwise */</span>
<a name="l00885"></a>00885         <span class="keywordflow">case</span> 1: <span class="comment">/* rotated 90 degrees clockwise */</span>
<a name="l00886"></a>00886                 {
<a name="l00887"></a>00887                         <span class="keywordflow">for</span> (row = 0; row &lt; src-&gt;h; ++row) {
<a name="l00888"></a>00888                                 srcBuf = (Uint8*)(src-&gt;pixels) + (row * src-&gt;pitch);
<a name="l00889"></a>00889                                 dstBuf = (Uint8*)(dst-&gt;pixels) + (dst-&gt;w - row - 1) * bpp;
<a name="l00890"></a>00890                                 <span class="keywordflow">for</span> (col = 0; col &lt; src-&gt;w; ++col) {
<a name="l00891"></a>00891                                         memcpy (dstBuf, srcBuf, bpp);
<a name="l00892"></a>00892                                         srcBuf += bpp;
<a name="l00893"></a>00893                                         dstBuf += dst-&gt;pitch;
<a name="l00894"></a>00894                                 } 
<a name="l00895"></a>00895                         } 
<a name="l00896"></a>00896                 }
<a name="l00897"></a>00897                 <span class="keywordflow">break</span>;
<a name="l00898"></a>00898 
<a name="l00899"></a>00899         <span class="keywordflow">case</span> 2: <span class="comment">/* rotated 180 degrees clockwise */</span>
<a name="l00900"></a>00900                 {
<a name="l00901"></a>00901                         <span class="keywordflow">for</span> (row = 0; row &lt; src-&gt;h; ++row) {
<a name="l00902"></a>00902                                 srcBuf = (Uint8*)(src-&gt;pixels) + (row * src-&gt;pitch);
<a name="l00903"></a>00903                                 dstBuf = (Uint8*)(dst-&gt;pixels) + ((dst-&gt;h - row - 1) * dst-&gt;pitch) + (dst-&gt;w - 1) * bpp;
<a name="l00904"></a>00904                                 <span class="keywordflow">for</span> (col = 0; col &lt; src-&gt;w; ++col) {
<a name="l00905"></a>00905                                         memcpy (dstBuf, srcBuf, bpp);
<a name="l00906"></a>00906                                         srcBuf += bpp;
<a name="l00907"></a>00907                                         dstBuf -= bpp;
<a name="l00908"></a>00908                                 } 
<a name="l00909"></a>00909                         } 
<a name="l00910"></a>00910                 }
<a name="l00911"></a>00911                 <span class="keywordflow">break</span>;
<a name="l00912"></a>00912 
<a name="l00913"></a>00913         <span class="keywordflow">case</span> 3: <span class="comment">/* rotated 270 degrees clockwise */</span>
<a name="l00914"></a>00914                 {
<a name="l00915"></a>00915                         <span class="keywordflow">for</span> (row = 0; row &lt; src-&gt;h; ++row) {
<a name="l00916"></a>00916                                 srcBuf = (Uint8*)(src-&gt;pixels) + (row * src-&gt;pitch);
<a name="l00917"></a>00917                                 dstBuf = (Uint8*)(dst-&gt;pixels) + (row * bpp) + (dst-&gt;h * dst-&gt;pitch);
<a name="l00918"></a>00918                                 <span class="keywordflow">for</span> (col = 0; col &lt; src-&gt;w; ++col) {
<a name="l00919"></a>00919                                         memcpy (dstBuf, srcBuf, bpp);
<a name="l00920"></a>00920                                         srcBuf += bpp;
<a name="l00921"></a>00921                                         dstBuf -= dst-&gt;pitch;
<a name="l00922"></a>00922                                 } 
<a name="l00923"></a>00923                         } 
<a name="l00924"></a>00924                 }
<a name="l00925"></a>00925                 <span class="keywordflow">break</span>;
<a name="l00926"></a>00926         } 
<a name="l00927"></a>00927         <span class="comment">/* end switch */</span>
<a name="l00928"></a>00928 
<a name="l00929"></a>00929         <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {
<a name="l00930"></a>00930                 SDL_UnlockSurface(src);
<a name="l00931"></a>00931         }
<a name="l00932"></a>00932         <span class="keywordflow">if</span> (SDL_MUSTLOCK(dst)) {
<a name="l00933"></a>00933                 SDL_UnlockSurface(dst);
<a name="l00934"></a>00934         }
<a name="l00935"></a>00935 
<a name="l00936"></a>00936         <span class="keywordflow">return</span> dst;
<a name="l00937"></a>00937 }
<a name="l00938"></a>00938 
<a name="l00939"></a>00939 
<a name="l00954"></a><a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8">00954</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_rotozoomSurfaceSizeTrig</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, 
<a name="l00955"></a>00955         <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight, 
<a name="l00956"></a>00956         <span class="keywordtype">double</span> *canglezoom, <span class="keywordtype">double</span> *sanglezoom)
<a name="l00957"></a>00957 {
<a name="l00958"></a>00958         <span class="keywordtype">double</span> x, y, cx, cy, sx, sy;
<a name="l00959"></a>00959         <span class="keywordtype">double</span> radangle;
<a name="l00960"></a>00960         <span class="keywordtype">int</span> dstwidthhalf, dstheighthalf;
<a name="l00961"></a>00961 
<a name="l00962"></a>00962         <span class="comment">/*</span>
<a name="l00963"></a>00963 <span class="comment">        * Determine destination width and height by rotating a centered source box </span>
<a name="l00964"></a>00964 <span class="comment">        */</span>
<a name="l00965"></a>00965         radangle = angle * (<a class="code" href="_s_d_l2__gfx_primitives_8h.html#ae71449b1cc6e6250b91f539153a7a0d3">M_PI</a> / 180.0);
<a name="l00966"></a>00966         *sanglezoom = sin(radangle);
<a name="l00967"></a>00967         *canglezoom = cos(radangle);
<a name="l00968"></a>00968         *sanglezoom *= zoomx;
<a name="l00969"></a>00969         *canglezoom *= zoomx;
<a name="l00970"></a>00970         x = (double)(width / 2);
<a name="l00971"></a>00971         y = (double)(height / 2);
<a name="l00972"></a>00972         cx = *canglezoom * x;
<a name="l00973"></a>00973         cy = *canglezoom * y;
<a name="l00974"></a>00974         sx = *sanglezoom * x;
<a name="l00975"></a>00975         sy = *sanglezoom * y;
<a name="l00976"></a>00976 
<a name="l00977"></a>00977         dstwidthhalf = <a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>((<span class="keywordtype">int</span>)
<a name="l00978"></a>00978                 ceil(<a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(fabs(cx + sy), fabs(cx - sy)), fabs(-cx + sy)), fabs(-cx - sy))), 1);
<a name="l00979"></a>00979         dstheighthalf = <a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>((<span class="keywordtype">int</span>)
<a name="l00980"></a>00980                 ceil(<a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(fabs(sx + cy), fabs(sx - cy)), fabs(-sx + cy)), fabs(-sx - cy))), 1);
<a name="l00981"></a>00981         *dstwidth = 2 * dstwidthhalf;
<a name="l00982"></a>00982         *dstheight = 2 * dstheighthalf;
<a name="l00983"></a>00983 }
<a name="l00984"></a>00984 
<a name="l00996"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#aa0126562efa572575e3962fe51d69e7c">00996</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aee64992d26c818d9975610754d5c929b" title="Returns the size of the resulting target surface for a rotozoomSurfaceXY() call.">rotozoomSurfaceSizeXY</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight)
<a name="l00997"></a>00997 {
<a name="l00998"></a>00998         <span class="keywordtype">double</span> dummy_sanglezoom, dummy_canglezoom;
<a name="l00999"></a>00999 
<a name="l01000"></a>01000         <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_rotozoomSurfaceSizeTrig</a>(width, height, angle, zoomx, zoomy, dstwidth, dstheight, &amp;dummy_sanglezoom, &amp;dummy_canglezoom);
<a name="l01001"></a>01001 }
<a name="l01002"></a>01002 
<a name="l01013"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#a9097c513174e2d97603292c08a9db923">01013</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#a9886c783255edfd70a4974f8f3dd5a8c" title="Returns the size of the resulting target surface for a rotozoomSurface() call.">rotozoomSurfaceSize</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoom, <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight)
<a name="l01014"></a>01014 {
<a name="l01015"></a>01015         <span class="keywordtype">double</span> dummy_sanglezoom, dummy_canglezoom;
<a name="l01016"></a>01016 
<a name="l01017"></a>01017         <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_rotozoomSurfaceSizeTrig</a>(width, height, angle, zoom, zoom, dstwidth, dstheight, &amp;dummy_sanglezoom, &amp;dummy_canglezoom);
<a name="l01018"></a>01018 }
<a name="l01019"></a>01019 
<a name="l01035"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#a6f5f31a362f63370dc60049df14d6856">01035</a> SDL_Surface *<a class="code" href="_s_d_l2__rotozoom_8c.html#a5f64ed53eeee5f2667971c857698d1e5" title="Rotates and zooms a surface and optional anti-aliasing.">rotozoomSurface</a>(SDL_Surface * src, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoom, <span class="keywordtype">int</span> smooth)
<a name="l01036"></a>01036 {
<a name="l01037"></a>01037         <span class="keywordflow">return</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aab98b5b0da4ea468bacf47f7b85f0ee2" title="Rotates and zooms a surface with different horizontal and vertival scaling factors and optional anti-...">rotozoomSurfaceXY</a>(src, angle, zoom, zoom, smooth);
<a name="l01038"></a>01038 }
<a name="l01039"></a>01039 
<a name="l01056"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#a592d84489ce544c050a9f3fe0e04f3f6">01056</a> SDL_Surface *<a class="code" href="_s_d_l2__rotozoom_8c.html#aab98b5b0da4ea468bacf47f7b85f0ee2" title="Rotates and zooms a surface with different horizontal and vertival scaling factors and optional anti-...">rotozoomSurfaceXY</a>(SDL_Surface * src, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> smooth)
<a name="l01057"></a>01057 {
<a name="l01058"></a>01058         SDL_Surface *rz_src;
<a name="l01059"></a>01059         SDL_Surface *rz_dst;
<a name="l01060"></a>01060         <span class="keywordtype">double</span> zoominv;
<a name="l01061"></a>01061         <span class="keywordtype">double</span> sanglezoom, canglezoom, sanglezoominv, canglezoominv;
<a name="l01062"></a>01062         <span class="keywordtype">int</span> dstwidthhalf, dstwidth, dstheighthalf, dstheight;
<a name="l01063"></a>01063         <span class="keywordtype">int</span> is32bit;
<a name="l01064"></a>01064         <span class="keywordtype">int</span> i, src_converted;
<a name="l01065"></a>01065         <span class="keywordtype">int</span> flipx,flipy;
<a name="l01066"></a>01066 
<a name="l01067"></a>01067         <span class="comment">/*</span>
<a name="l01068"></a>01068 <span class="comment">        * Sanity check </span>
<a name="l01069"></a>01069 <span class="comment">        */</span>
<a name="l01070"></a>01070         <span class="keywordflow">if</span> (src == NULL) {
<a name="l01071"></a>01071                 <span class="keywordflow">return</span> (NULL);
<a name="l01072"></a>01072         }
<a name="l01073"></a>01073 
<a name="l01074"></a>01074         <span class="comment">/*</span>
<a name="l01075"></a>01075 <span class="comment">        * Determine if source surface is 32bit or 8bit </span>
<a name="l01076"></a>01076 <span class="comment">        */</span>
<a name="l01077"></a>01077         is32bit = (src-&gt;format-&gt;BitsPerPixel == 32);
<a name="l01078"></a>01078         <span class="keywordflow">if</span> ((is32bit) || (src-&gt;format-&gt;BitsPerPixel == 8)) {
<a name="l01079"></a>01079                 <span class="comment">/*</span>
<a name="l01080"></a>01080 <span class="comment">                * Use source surface &#39;as is&#39; </span>
<a name="l01081"></a>01081 <span class="comment">                */</span>
<a name="l01082"></a>01082                 rz_src = src;
<a name="l01083"></a>01083                 src_converted = 0;
<a name="l01084"></a>01084         } <span class="keywordflow">else</span> {
<a name="l01085"></a>01085                 <span class="comment">/*</span>
<a name="l01086"></a>01086 <span class="comment">                * New source surface is 32bit with a defined RGBA ordering </span>
<a name="l01087"></a>01087 <span class="comment">                */</span>
<a name="l01088"></a>01088                 rz_src =
<a name="l01089"></a>01089                         SDL_CreateRGBSurface(SDL_SWSURFACE, src-&gt;w, src-&gt;h, 32, 
<a name="l01090"></a>01090 #<span class="keywordflow">if</span> SDL_BYTEORDER == SDL_LIL_ENDIAN
<a name="l01091"></a>01091                         0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
<a name="l01092"></a>01092 #<span class="keywordflow">else</span>
<a name="l01093"></a>01093                         0xff000000,  0x00ff0000, 0x0000ff00, 0x000000ff
<a name="l01094"></a>01094 #endif
<a name="l01095"></a>01095                         );
<a name="l01096"></a>01096 
<a name="l01097"></a>01097                 SDL_BlitSurface(src, NULL, rz_src, NULL);
<a name="l01098"></a>01098 
<a name="l01099"></a>01099                 src_converted = 1;
<a name="l01100"></a>01100                 is32bit = 1;
<a name="l01101"></a>01101         }
<a name="l01102"></a>01102 
<a name="l01103"></a>01103         <span class="comment">/*</span>
<a name="l01104"></a>01104 <span class="comment">        * Sanity check zoom factor </span>
<a name="l01105"></a>01105 <span class="comment">        */</span>
<a name="l01106"></a>01106         flipx = (zoomx&lt;0.0);
<a name="l01107"></a>01107         <span class="keywordflow">if</span> (flipx) zoomx=-zoomx;
<a name="l01108"></a>01108         flipy = (zoomy&lt;0.0);
<a name="l01109"></a>01109         <span class="keywordflow">if</span> (flipy) zoomy=-zoomy;
<a name="l01110"></a>01110         <span class="keywordflow">if</span> (zoomx &lt; <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) zoomx = <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01111"></a>01111         <span class="keywordflow">if</span> (zoomy &lt; <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) zoomy = <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01112"></a>01112         zoominv = 65536.0 / (zoomx * zoomx);
<a name="l01113"></a>01113 
<a name="l01114"></a>01114         <span class="comment">/*</span>
<a name="l01115"></a>01115 <span class="comment">        * Check if we have a rotozoom or just a zoom </span>
<a name="l01116"></a>01116 <span class="comment">        */</span>
<a name="l01117"></a>01117         <span class="keywordflow">if</span> (fabs(angle) &gt; <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) {
<a name="l01118"></a>01118 
<a name="l01119"></a>01119                 <span class="comment">/*</span>
<a name="l01120"></a>01120 <span class="comment">                * Angle!=0: full rotozoom </span>
<a name="l01121"></a>01121 <span class="comment">                */</span>
<a name="l01122"></a>01122                 <span class="comment">/*</span>
<a name="l01123"></a>01123 <span class="comment">                * ----------------------- </span>
<a name="l01124"></a>01124 <span class="comment">                */</span>
<a name="l01125"></a>01125 
<a name="l01126"></a>01126                 <span class="comment">/* Determine target size */</span>
<a name="l01127"></a>01127                 <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_rotozoomSurfaceSizeTrig</a>(rz_src-&gt;w, rz_src-&gt;h, angle, zoomx, zoomy, &amp;dstwidth, &amp;dstheight, &amp;canglezoom, &amp;sanglezoom);
<a name="l01128"></a>01128 
<a name="l01129"></a>01129                 <span class="comment">/*</span>
<a name="l01130"></a>01130 <span class="comment">                * Calculate target factors from sin/cos and zoom </span>
<a name="l01131"></a>01131 <span class="comment">                */</span>
<a name="l01132"></a>01132                 sanglezoominv = sanglezoom;
<a name="l01133"></a>01133                 canglezoominv = canglezoom;
<a name="l01134"></a>01134                 sanglezoominv *= zoominv;
<a name="l01135"></a>01135                 canglezoominv *= zoominv;
<a name="l01136"></a>01136 
<a name="l01137"></a>01137                 <span class="comment">/* Calculate half size */</span>
<a name="l01138"></a>01138                 dstwidthhalf = dstwidth / 2;
<a name="l01139"></a>01139                 dstheighthalf = dstheight / 2;
<a name="l01140"></a>01140 
<a name="l01141"></a>01141                 <span class="comment">/*</span>
<a name="l01142"></a>01142 <span class="comment">                * Alloc space to completely contain the rotated surface </span>
<a name="l01143"></a>01143 <span class="comment">                */</span>
<a name="l01144"></a>01144                 rz_dst = NULL;
<a name="l01145"></a>01145                 <span class="keywordflow">if</span> (is32bit) {
<a name="l01146"></a>01146                         <span class="comment">/*</span>
<a name="l01147"></a>01147 <span class="comment">                        * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01148"></a>01148 <span class="comment">                        */</span>
<a name="l01149"></a>01149                         rz_dst =
<a name="l01150"></a>01150                                 SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01151"></a>01151                                 rz_src-&gt;format-&gt;Rmask, rz_src-&gt;format-&gt;Gmask,
<a name="l01152"></a>01152                                 rz_src-&gt;format-&gt;Bmask, rz_src-&gt;format-&gt;Amask);
<a name="l01153"></a>01153                 } <span class="keywordflow">else</span> {
<a name="l01154"></a>01154                         <span class="comment">/*</span>
<a name="l01155"></a>01155 <span class="comment">                        * Target surface is 8bit </span>
<a name="l01156"></a>01156 <span class="comment">                        */</span>
<a name="l01157"></a>01157                         rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01158"></a>01158                 }
<a name="l01159"></a>01159 
<a name="l01160"></a>01160                 <span class="comment">/* Check target */</span>
<a name="l01161"></a>01161                 <span class="keywordflow">if</span> (rz_dst == NULL)
<a name="l01162"></a>01162                         <span class="keywordflow">return</span> NULL;
<a name="l01163"></a>01163 
<a name="l01164"></a>01164                 <span class="comment">/* Adjust for guard rows */</span>
<a name="l01165"></a>01165                 rz_dst-&gt;h = dstheight;
<a name="l01166"></a>01166 
<a name="l01167"></a>01167                 <span class="comment">/*</span>
<a name="l01168"></a>01168 <span class="comment">                * Lock source surface </span>
<a name="l01169"></a>01169 <span class="comment">                */</span>
<a name="l01170"></a>01170                 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01171"></a>01171                         SDL_LockSurface(rz_src);
<a name="l01172"></a>01172                 }
<a name="l01173"></a>01173 
<a name="l01174"></a>01174                 <span class="comment">/*</span>
<a name="l01175"></a>01175 <span class="comment">                * Check which kind of surface we have </span>
<a name="l01176"></a>01176 <span class="comment">                */</span>
<a name="l01177"></a>01177                 <span class="keywordflow">if</span> (is32bit) {
<a name="l01178"></a>01178                         <span class="comment">/*</span>
<a name="l01179"></a>01179 <span class="comment">                        * Call the 32bit transformation routine to do the rotation (using alpha) </span>
<a name="l01180"></a>01180 <span class="comment">                        */</span>
<a name="l01181"></a>01181                         <a class="code" href="_s_d_l2__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7" title="Internal 32 bit rotozoomer with optional anti-aliasing.">_transformSurfaceRGBA</a>(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
<a name="l01182"></a>01182                                 (<span class="keywordtype">int</span>) (sanglezoominv), (<span class="keywordtype">int</span>) (canglezoominv), 
<a name="l01183"></a>01183                                 flipx, flipy,
<a name="l01184"></a>01184                                 smooth);
<a name="l01185"></a>01185                 } <span class="keywordflow">else</span> {
<a name="l01186"></a>01186                         <span class="comment">/*</span>
<a name="l01187"></a>01187 <span class="comment">                        * Copy palette and colorkey info </span>
<a name="l01188"></a>01188 <span class="comment">                        */</span>
<a name="l01189"></a>01189                         <span class="keywordflow">for</span> (i = 0; i &lt; rz_src-&gt;format-&gt;palette-&gt;ncolors; i++) {
<a name="l01190"></a>01190                                 rz_dst-&gt;format-&gt;palette-&gt;colors[i] = rz_src-&gt;format-&gt;palette-&gt;colors[i];
<a name="l01191"></a>01191                         }
<a name="l01192"></a>01192                         rz_dst-&gt;format-&gt;palette-&gt;ncolors = rz_src-&gt;format-&gt;palette-&gt;ncolors;
<a name="l01193"></a>01193                         <span class="comment">/*</span>
<a name="l01194"></a>01194 <span class="comment">                        * Call the 8bit transformation routine to do the rotation </span>
<a name="l01195"></a>01195 <span class="comment">                        */</span>
<a name="l01196"></a>01196                         <a class="code" href="_s_d_l2__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c" title="Rotates and zooms 8 bit palette/Y &#39;src&#39; surface to &#39;dst&#39; surface without smoothing.">transformSurfaceY</a>(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
<a name="l01197"></a>01197                                 (<span class="keywordtype">int</span>) (sanglezoominv), (<span class="keywordtype">int</span>) (canglezoominv),
<a name="l01198"></a>01198                                 flipx, flipy);
<a name="l01199"></a>01199                 }
<a name="l01200"></a>01200                 <span class="comment">/*</span>
<a name="l01201"></a>01201 <span class="comment">                * Unlock source surface </span>
<a name="l01202"></a>01202 <span class="comment">                */</span>
<a name="l01203"></a>01203                 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01204"></a>01204                         SDL_UnlockSurface(rz_src);
<a name="l01205"></a>01205                 }
<a name="l01206"></a>01206 
<a name="l01207"></a>01207         } <span class="keywordflow">else</span> {
<a name="l01208"></a>01208 
<a name="l01209"></a>01209                 <span class="comment">/*</span>
<a name="l01210"></a>01210 <span class="comment">                * Angle=0: Just a zoom </span>
<a name="l01211"></a>01211 <span class="comment">                */</span>
<a name="l01212"></a>01212                 <span class="comment">/*</span>
<a name="l01213"></a>01213 <span class="comment">                * -------------------- </span>
<a name="l01214"></a>01214 <span class="comment">                */</span>
<a name="l01215"></a>01215 
<a name="l01216"></a>01216                 <span class="comment">/*</span>
<a name="l01217"></a>01217 <span class="comment">                * Calculate target size</span>
<a name="l01218"></a>01218 <span class="comment">                */</span>
<a name="l01219"></a>01219                 <a class="code" href="_s_d_l2__rotozoom_8c.html#a8ba40859c1a977dae87488dd8be1bf9a" title="Calculates the size of the target surface for a zoomSurface() call.">zoomSurfaceSize</a>(rz_src-&gt;w, rz_src-&gt;h, zoomx, zoomy, &amp;dstwidth, &amp;dstheight);
<a name="l01220"></a>01220 
<a name="l01221"></a>01221                 <span class="comment">/*</span>
<a name="l01222"></a>01222 <span class="comment">                * Alloc space to completely contain the zoomed surface </span>
<a name="l01223"></a>01223 <span class="comment">                */</span>
<a name="l01224"></a>01224                 rz_dst = NULL;
<a name="l01225"></a>01225                 <span class="keywordflow">if</span> (is32bit) {
<a name="l01226"></a>01226                         <span class="comment">/*</span>
<a name="l01227"></a>01227 <span class="comment">                        * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01228"></a>01228 <span class="comment">                        */</span>
<a name="l01229"></a>01229                         rz_dst =
<a name="l01230"></a>01230                                 SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01231"></a>01231                                 rz_src-&gt;format-&gt;Rmask, rz_src-&gt;format-&gt;Gmask,
<a name="l01232"></a>01232                                 rz_src-&gt;format-&gt;Bmask, rz_src-&gt;format-&gt;Amask);
<a name="l01233"></a>01233                 } <span class="keywordflow">else</span> {
<a name="l01234"></a>01234                         <span class="comment">/*</span>
<a name="l01235"></a>01235 <span class="comment">                        * Target surface is 8bit </span>
<a name="l01236"></a>01236 <span class="comment">                        */</span>
<a name="l01237"></a>01237                         rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01238"></a>01238                 }
<a name="l01239"></a>01239 
<a name="l01240"></a>01240                 <span class="comment">/* Check target */</span>
<a name="l01241"></a>01241                 <span class="keywordflow">if</span> (rz_dst == NULL)
<a name="l01242"></a>01242                         <span class="keywordflow">return</span> NULL;
<a name="l01243"></a>01243 
<a name="l01244"></a>01244                 <span class="comment">/* Adjust for guard rows */</span>
<a name="l01245"></a>01245                 rz_dst-&gt;h = dstheight;
<a name="l01246"></a>01246 
<a name="l01247"></a>01247                 <span class="comment">/*</span>
<a name="l01248"></a>01248 <span class="comment">                * Lock source surface </span>
<a name="l01249"></a>01249 <span class="comment">                */</span>
<a name="l01250"></a>01250                 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01251"></a>01251                         SDL_LockSurface(rz_src);
<a name="l01252"></a>01252                 }
<a name="l01253"></a>01253 
<a name="l01254"></a>01254                 <span class="comment">/*</span>
<a name="l01255"></a>01255 <span class="comment">                * Check which kind of surface we have </span>
<a name="l01256"></a>01256 <span class="comment">                */</span>
<a name="l01257"></a>01257                 <span class="keywordflow">if</span> (is32bit) {
<a name="l01258"></a>01258                         <span class="comment">/*</span>
<a name="l01259"></a>01259 <span class="comment">                        * Call the 32bit transformation routine to do the zooming (using alpha) </span>
<a name="l01260"></a>01260 <span class="comment">                        */</span>
<a name="l01261"></a>01261                         <a class="code" href="_s_d_l2__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81" title="Internal 32 bit Zoomer with optional anti-aliasing by bilinear interpolation.">_zoomSurfaceRGBA</a>(rz_src, rz_dst, flipx, flipy, smooth);
<a name="l01262"></a>01262 
<a name="l01263"></a>01263                 } <span class="keywordflow">else</span> {
<a name="l01264"></a>01264                         <span class="comment">/*</span>
<a name="l01265"></a>01265 <span class="comment">                        * Copy palette and colorkey info </span>
<a name="l01266"></a>01266 <span class="comment">                        */</span>
<a name="l01267"></a>01267                         <span class="keywordflow">for</span> (i = 0; i &lt; rz_src-&gt;format-&gt;palette-&gt;ncolors; i++) {
<a name="l01268"></a>01268                                 rz_dst-&gt;format-&gt;palette-&gt;colors[i] = rz_src-&gt;format-&gt;palette-&gt;colors[i];
<a name="l01269"></a>01269                         }
<a name="l01270"></a>01270                         rz_dst-&gt;format-&gt;palette-&gt;ncolors = rz_src-&gt;format-&gt;palette-&gt;ncolors;
<a name="l01271"></a>01271 
<a name="l01272"></a>01272                         <span class="comment">/*</span>
<a name="l01273"></a>01273 <span class="comment">                        * Call the 8bit transformation routine to do the zooming </span>
<a name="l01274"></a>01274 <span class="comment">                        */</span>
<a name="l01275"></a>01275                         <a class="code" href="_s_d_l2__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29" title="Internal 8 bit Zoomer without smoothing.">_zoomSurfaceY</a>(rz_src, rz_dst, flipx, flipy);
<a name="l01276"></a>01276                 }
<a name="l01277"></a>01277 
<a name="l01278"></a>01278                 <span class="comment">/*</span>
<a name="l01279"></a>01279 <span class="comment">                * Unlock source surface </span>
<a name="l01280"></a>01280 <span class="comment">                */</span>
<a name="l01281"></a>01281                 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01282"></a>01282                         SDL_UnlockSurface(rz_src);
<a name="l01283"></a>01283                 }
<a name="l01284"></a>01284         }
<a name="l01285"></a>01285 
<a name="l01286"></a>01286         <span class="comment">/*</span>
<a name="l01287"></a>01287 <span class="comment">        * Cleanup temp surface </span>
<a name="l01288"></a>01288 <span class="comment">        */</span>
<a name="l01289"></a>01289         <span class="keywordflow">if</span> (src_converted) {
<a name="l01290"></a>01290                 SDL_FreeSurface(rz_src);
<a name="l01291"></a>01291         }
<a name="l01292"></a>01292 
<a name="l01293"></a>01293         <span class="comment">/*</span>
<a name="l01294"></a>01294 <span class="comment">        * Return destination surface </span>
<a name="l01295"></a>01295 <span class="comment">        */</span>
<a name="l01296"></a>01296         <span class="keywordflow">return</span> (rz_dst);
<a name="l01297"></a>01297 }
<a name="l01298"></a>01298 
<a name="l01311"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#a87a121da75a099fd980295c759a7005d">01311</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#a8ba40859c1a977dae87488dd8be1bf9a" title="Calculates the size of the target surface for a zoomSurface() call.">zoomSurfaceSize</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight)
<a name="l01312"></a>01312 {
<a name="l01313"></a>01313         <span class="comment">/*</span>
<a name="l01314"></a>01314 <span class="comment">        * Make zoom factors positive </span>
<a name="l01315"></a>01315 <span class="comment">        */</span>
<a name="l01316"></a>01316         <span class="keywordtype">int</span> flipx, flipy;
<a name="l01317"></a>01317         flipx = (zoomx&lt;0.0);
<a name="l01318"></a>01318         <span class="keywordflow">if</span> (flipx) zoomx = -zoomx;
<a name="l01319"></a>01319         flipy = (zoomy&lt;0.0);
<a name="l01320"></a>01320         <span class="keywordflow">if</span> (flipy) zoomy = -zoomy;
<a name="l01321"></a>01321 
<a name="l01322"></a>01322         <span class="comment">/*</span>
<a name="l01323"></a>01323 <span class="comment">        * Sanity check zoom factors </span>
<a name="l01324"></a>01324 <span class="comment">        */</span>
<a name="l01325"></a>01325         <span class="keywordflow">if</span> (zoomx &lt; <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) {
<a name="l01326"></a>01326                 zoomx = <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01327"></a>01327         }
<a name="l01328"></a>01328         <span class="keywordflow">if</span> (zoomy &lt; <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) {
<a name="l01329"></a>01329                 zoomy = <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01330"></a>01330         }
<a name="l01331"></a>01331 
<a name="l01332"></a>01332         <span class="comment">/*</span>
<a name="l01333"></a>01333 <span class="comment">        * Calculate target size </span>
<a name="l01334"></a>01334 <span class="comment">        */</span>
<a name="l01335"></a>01335         *dstwidth = (int) floor(((<span class="keywordtype">double</span>) width * zoomx) + 0.5);
<a name="l01336"></a>01336         *dstheight = (int) floor(((<span class="keywordtype">double</span>) height * zoomy) + 0.5);
<a name="l01337"></a>01337         <span class="keywordflow">if</span> (*dstwidth &lt; 1) {
<a name="l01338"></a>01338                 *dstwidth = 1;
<a name="l01339"></a>01339         }
<a name="l01340"></a>01340         <span class="keywordflow">if</span> (*dstheight &lt; 1) {
<a name="l01341"></a>01341                 *dstheight = 1;
<a name="l01342"></a>01342         }
<a name="l01343"></a>01343 }
<a name="l01344"></a>01344 
<a name="l01361"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#a0867857132421429994198cabacb0528">01361</a> SDL_Surface *<a class="code" href="_s_d_l2__rotozoom_8c.html#abdd772b2f6b1f26134e4e90cda657a21" title="Zoom a surface by independent horizontal and vertical factors with optional smoothing.">zoomSurface</a>(SDL_Surface * src, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> smooth)
<a name="l01362"></a>01362 {
<a name="l01363"></a>01363         SDL_Surface *rz_src;
<a name="l01364"></a>01364         SDL_Surface *rz_dst;
<a name="l01365"></a>01365         <span class="keywordtype">int</span> dstwidth, dstheight;
<a name="l01366"></a>01366         <span class="keywordtype">int</span> is32bit;
<a name="l01367"></a>01367         <span class="keywordtype">int</span> i, src_converted;
<a name="l01368"></a>01368         <span class="keywordtype">int</span> flipx, flipy;
<a name="l01369"></a>01369 
<a name="l01370"></a>01370         <span class="comment">/*</span>
<a name="l01371"></a>01371 <span class="comment">        * Sanity check </span>
<a name="l01372"></a>01372 <span class="comment">        */</span>
<a name="l01373"></a>01373         <span class="keywordflow">if</span> (src == NULL)
<a name="l01374"></a>01374                 <span class="keywordflow">return</span> (NULL);
<a name="l01375"></a>01375 
<a name="l01376"></a>01376         <span class="comment">/*</span>
<a name="l01377"></a>01377 <span class="comment">        * Determine if source surface is 32bit or 8bit </span>
<a name="l01378"></a>01378 <span class="comment">        */</span>
<a name="l01379"></a>01379         is32bit = (src-&gt;format-&gt;BitsPerPixel == 32);
<a name="l01380"></a>01380         <span class="keywordflow">if</span> ((is32bit) || (src-&gt;format-&gt;BitsPerPixel == 8)) {
<a name="l01381"></a>01381                 <span class="comment">/*</span>
<a name="l01382"></a>01382 <span class="comment">                * Use source surface &#39;as is&#39; </span>
<a name="l01383"></a>01383 <span class="comment">                */</span>
<a name="l01384"></a>01384                 rz_src = src;
<a name="l01385"></a>01385                 src_converted = 0;
<a name="l01386"></a>01386         } <span class="keywordflow">else</span> {
<a name="l01387"></a>01387                 <span class="comment">/*</span>
<a name="l01388"></a>01388 <span class="comment">                * New source surface is 32bit with a defined RGBA ordering </span>
<a name="l01389"></a>01389 <span class="comment">                */</span>
<a name="l01390"></a>01390                 rz_src =
<a name="l01391"></a>01391                         SDL_CreateRGBSurface(SDL_SWSURFACE, src-&gt;w, src-&gt;h, 32, 
<a name="l01392"></a>01392 #<span class="keywordflow">if</span> SDL_BYTEORDER == SDL_LIL_ENDIAN
<a name="l01393"></a>01393                         0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
<a name="l01394"></a>01394 #<span class="keywordflow">else</span>
<a name="l01395"></a>01395                         0xff000000,  0x00ff0000, 0x0000ff00, 0x000000ff
<a name="l01396"></a>01396 #endif
<a name="l01397"></a>01397                         );
<a name="l01398"></a>01398                 <span class="keywordflow">if</span> (rz_src == NULL) {
<a name="l01399"></a>01399                         <span class="keywordflow">return</span> NULL;
<a name="l01400"></a>01400                 }
<a name="l01401"></a>01401                 SDL_BlitSurface(src, NULL, rz_src, NULL);
<a name="l01402"></a>01402                 src_converted = 1;
<a name="l01403"></a>01403                 is32bit = 1;
<a name="l01404"></a>01404         }
<a name="l01405"></a>01405 
<a name="l01406"></a>01406         flipx = (zoomx&lt;0.0);
<a name="l01407"></a>01407         <span class="keywordflow">if</span> (flipx) zoomx = -zoomx;
<a name="l01408"></a>01408         flipy = (zoomy&lt;0.0);
<a name="l01409"></a>01409         <span class="keywordflow">if</span> (flipy) zoomy = -zoomy;
<a name="l01410"></a>01410 
<a name="l01411"></a>01411         <span class="comment">/* Get size if target */</span>
<a name="l01412"></a>01412         <a class="code" href="_s_d_l2__rotozoom_8c.html#a8ba40859c1a977dae87488dd8be1bf9a" title="Calculates the size of the target surface for a zoomSurface() call.">zoomSurfaceSize</a>(rz_src-&gt;w, rz_src-&gt;h, zoomx, zoomy, &amp;dstwidth, &amp;dstheight);
<a name="l01413"></a>01413 
<a name="l01414"></a>01414         <span class="comment">/*</span>
<a name="l01415"></a>01415 <span class="comment">        * Alloc space to completely contain the zoomed surface </span>
<a name="l01416"></a>01416 <span class="comment">        */</span>
<a name="l01417"></a>01417         rz_dst = NULL;
<a name="l01418"></a>01418         <span class="keywordflow">if</span> (is32bit) {
<a name="l01419"></a>01419                 <span class="comment">/*</span>
<a name="l01420"></a>01420 <span class="comment">                * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01421"></a>01421 <span class="comment">                */</span>
<a name="l01422"></a>01422                 rz_dst =
<a name="l01423"></a>01423                         SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01424"></a>01424                         rz_src-&gt;format-&gt;Rmask, rz_src-&gt;format-&gt;Gmask,
<a name="l01425"></a>01425                         rz_src-&gt;format-&gt;Bmask, rz_src-&gt;format-&gt;Amask);
<a name="l01426"></a>01426         } <span class="keywordflow">else</span> {
<a name="l01427"></a>01427                 <span class="comment">/*</span>
<a name="l01428"></a>01428 <span class="comment">                * Target surface is 8bit </span>
<a name="l01429"></a>01429 <span class="comment">                */</span>
<a name="l01430"></a>01430                 rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01431"></a>01431         }
<a name="l01432"></a>01432 
<a name="l01433"></a>01433         <span class="comment">/* Check target */</span>
<a name="l01434"></a>01434         <span class="keywordflow">if</span> (rz_dst == NULL) {
<a name="l01435"></a>01435                 <span class="comment">/*</span>
<a name="l01436"></a>01436 <span class="comment">                * Cleanup temp surface </span>
<a name="l01437"></a>01437 <span class="comment">                */</span>
<a name="l01438"></a>01438                 <span class="keywordflow">if</span> (src_converted) {
<a name="l01439"></a>01439                         SDL_FreeSurface(rz_src);
<a name="l01440"></a>01440                 }               
<a name="l01441"></a>01441                 <span class="keywordflow">return</span> NULL;
<a name="l01442"></a>01442         }
<a name="l01443"></a>01443 
<a name="l01444"></a>01444         <span class="comment">/* Adjust for guard rows */</span>
<a name="l01445"></a>01445         rz_dst-&gt;h = dstheight;
<a name="l01446"></a>01446 
<a name="l01447"></a>01447         <span class="comment">/*</span>
<a name="l01448"></a>01448 <span class="comment">        * Lock source surface </span>
<a name="l01449"></a>01449 <span class="comment">        */</span>
<a name="l01450"></a>01450         <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01451"></a>01451                 SDL_LockSurface(rz_src);
<a name="l01452"></a>01452         }
<a name="l01453"></a>01453 
<a name="l01454"></a>01454         <span class="comment">/*</span>
<a name="l01455"></a>01455 <span class="comment">        * Check which kind of surface we have </span>
<a name="l01456"></a>01456 <span class="comment">        */</span>
<a name="l01457"></a>01457         <span class="keywordflow">if</span> (is32bit) {
<a name="l01458"></a>01458                 <span class="comment">/*</span>
<a name="l01459"></a>01459 <span class="comment">                * Call the 32bit transformation routine to do the zooming (using alpha) </span>
<a name="l01460"></a>01460 <span class="comment">                */</span>
<a name="l01461"></a>01461                 <a class="code" href="_s_d_l2__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81" title="Internal 32 bit Zoomer with optional anti-aliasing by bilinear interpolation.">_zoomSurfaceRGBA</a>(rz_src, rz_dst, flipx, flipy, smooth);
<a name="l01462"></a>01462         } <span class="keywordflow">else</span> {
<a name="l01463"></a>01463                 <span class="comment">/*</span>
<a name="l01464"></a>01464 <span class="comment">                * Copy palette and colorkey info </span>
<a name="l01465"></a>01465 <span class="comment">                */</span>
<a name="l01466"></a>01466                 <span class="keywordflow">for</span> (i = 0; i &lt; rz_src-&gt;format-&gt;palette-&gt;ncolors; i++) {
<a name="l01467"></a>01467                         rz_dst-&gt;format-&gt;palette-&gt;colors[i] = rz_src-&gt;format-&gt;palette-&gt;colors[i];
<a name="l01468"></a>01468                 }
<a name="l01469"></a>01469                 rz_dst-&gt;format-&gt;palette-&gt;ncolors = rz_src-&gt;format-&gt;palette-&gt;ncolors;
<a name="l01470"></a>01470                 <span class="comment">/*</span>
<a name="l01471"></a>01471 <span class="comment">                * Call the 8bit transformation routine to do the zooming </span>
<a name="l01472"></a>01472 <span class="comment">                */</span>
<a name="l01473"></a>01473                 <a class="code" href="_s_d_l2__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29" title="Internal 8 bit Zoomer without smoothing.">_zoomSurfaceY</a>(rz_src, rz_dst, flipx, flipy);
<a name="l01474"></a>01474         }
<a name="l01475"></a>01475         <span class="comment">/*</span>
<a name="l01476"></a>01476 <span class="comment">        * Unlock source surface </span>
<a name="l01477"></a>01477 <span class="comment">        */</span>
<a name="l01478"></a>01478         <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01479"></a>01479                 SDL_UnlockSurface(rz_src);
<a name="l01480"></a>01480         }
<a name="l01481"></a>01481 
<a name="l01482"></a>01482         <span class="comment">/*</span>
<a name="l01483"></a>01483 <span class="comment">        * Cleanup temp surface </span>
<a name="l01484"></a>01484 <span class="comment">        */</span>
<a name="l01485"></a>01485         <span class="keywordflow">if</span> (src_converted) {
<a name="l01486"></a>01486                 SDL_FreeSurface(rz_src);
<a name="l01487"></a>01487         }
<a name="l01488"></a>01488 
<a name="l01489"></a>01489         <span class="comment">/*</span>
<a name="l01490"></a>01490 <span class="comment">        * Return destination surface </span>
<a name="l01491"></a>01491 <span class="comment">        */</span>
<a name="l01492"></a>01492         <span class="keywordflow">return</span> (rz_dst);
<a name="l01493"></a>01493 }
<a name="l01494"></a>01494 
<a name="l01511"></a>01511 <span class="comment">/*@null@*/</span> 
<a name="l01512"></a><a class="code" href="_s_d_l2__rotozoom_8h.html#a9adfe732cbca348e3287096e7c67e72d">01512</a> SDL_Surface *<a class="code" href="_s_d_l2__rotozoom_8c.html#aad3bf0cd89cc39ff874ffa778fa1495d" title="Shrink a surface by an integer ratio using averaging.">shrinkSurface</a>(SDL_Surface *src, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)
<a name="l01513"></a>01513 {
<a name="l01514"></a>01514         <span class="keywordtype">int</span> result;
<a name="l01515"></a>01515         SDL_Surface *rz_src;
<a name="l01516"></a>01516         SDL_Surface *rz_dst = NULL;
<a name="l01517"></a>01517         <span class="keywordtype">int</span> dstwidth, dstheight;
<a name="l01518"></a>01518         <span class="keywordtype">int</span> is32bit;
<a name="l01519"></a>01519         <span class="keywordtype">int</span> i, src_converted;
<a name="l01520"></a>01520         <span class="keywordtype">int</span> haveError = 0;
<a name="l01521"></a>01521 
<a name="l01522"></a>01522         <span class="comment">/*</span>
<a name="l01523"></a>01523 <span class="comment">        * Sanity check </span>
<a name="l01524"></a>01524 <span class="comment">        */</span>
<a name="l01525"></a>01525         <span class="keywordflow">if</span> (src == NULL) {
<a name="l01526"></a>01526                 <span class="keywordflow">return</span> (NULL);
<a name="l01527"></a>01527         }
<a name="l01528"></a>01528 
<a name="l01529"></a>01529         <span class="comment">/*</span>
<a name="l01530"></a>01530 <span class="comment">        * Determine if source surface is 32bit or 8bit </span>
<a name="l01531"></a>01531 <span class="comment">        */</span>
<a name="l01532"></a>01532         is32bit = (src-&gt;format-&gt;BitsPerPixel == 32);
<a name="l01533"></a>01533         <span class="keywordflow">if</span> ((is32bit) || (src-&gt;format-&gt;BitsPerPixel == 8)) {
<a name="l01534"></a>01534                 <span class="comment">/*</span>
<a name="l01535"></a>01535 <span class="comment">                * Use source surface &#39;as is&#39; </span>
<a name="l01536"></a>01536 <span class="comment">                */</span>
<a name="l01537"></a>01537                 rz_src = src;
<a name="l01538"></a>01538                 src_converted = 0;
<a name="l01539"></a>01539         } <span class="keywordflow">else</span> {
<a name="l01540"></a>01540                 <span class="comment">/*</span>
<a name="l01541"></a>01541 <span class="comment">                * New source surface is 32bit with a defined RGBA ordering </span>
<a name="l01542"></a>01542 <span class="comment">                */</span>
<a name="l01543"></a>01543                 rz_src = SDL_CreateRGBSurface(SDL_SWSURFACE, src-&gt;w, src-&gt;h, 32, 
<a name="l01544"></a>01544 #<span class="keywordflow">if</span> SDL_BYTEORDER == SDL_LIL_ENDIAN
<a name="l01545"></a>01545                         0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
<a name="l01546"></a>01546 #<span class="keywordflow">else</span>
<a name="l01547"></a>01547                         0xff000000,  0x00ff0000, 0x0000ff00, 0x000000ff
<a name="l01548"></a>01548 #endif
<a name="l01549"></a>01549                         );
<a name="l01550"></a>01550                 <span class="keywordflow">if</span> (rz_src==NULL) {
<a name="l01551"></a>01551                         haveError = 1;
<a name="l01552"></a>01552                         <span class="keywordflow">goto</span> exitShrinkSurface;
<a name="l01553"></a>01553                 }
<a name="l01554"></a>01554 
<a name="l01555"></a>01555                 SDL_BlitSurface(src, NULL, rz_src, NULL);
<a name="l01556"></a>01556                 src_converted = 1;
<a name="l01557"></a>01557                 is32bit = 1;
<a name="l01558"></a>01558         }
<a name="l01559"></a>01559 
<a name="l01560"></a>01560         <span class="comment">/*</span>
<a name="l01561"></a>01561 <span class="comment">        * Lock the surface </span>
<a name="l01562"></a>01562 <span class="comment">        */</span>
<a name="l01563"></a>01563         <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01564"></a>01564                 <span class="keywordflow">if</span> (SDL_LockSurface(rz_src) &lt; 0) {
<a name="l01565"></a>01565                         haveError = 1;
<a name="l01566"></a>01566                         <span class="keywordflow">goto</span> exitShrinkSurface;
<a name="l01567"></a>01567                 }
<a name="l01568"></a>01568         }
<a name="l01569"></a>01569 
<a name="l01570"></a>01570         <span class="comment">/* Get size for target */</span>
<a name="l01571"></a>01571         dstwidth=rz_src-&gt;w/factorx;
<a name="l01572"></a>01572         <span class="keywordflow">while</span> (dstwidth*factorx&gt;rz_src-&gt;w) { dstwidth--; }
<a name="l01573"></a>01573         dstheight=rz_src-&gt;h/factory;
<a name="l01574"></a>01574         <span class="keywordflow">while</span> (dstheight*factory&gt;rz_src-&gt;h) { dstheight--; }
<a name="l01575"></a>01575 
<a name="l01576"></a>01576         <span class="comment">/*</span>
<a name="l01577"></a>01577 <span class="comment">        * Alloc space to completely contain the shrunken surface</span>
<a name="l01578"></a>01578 <span class="comment">        * (with added guard rows)</span>
<a name="l01579"></a>01579 <span class="comment">        */</span>
<a name="l01580"></a>01580         <span class="keywordflow">if</span> (is32bit==1) {
<a name="l01581"></a>01581                 <span class="comment">/*</span>
<a name="l01582"></a>01582 <span class="comment">                * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01583"></a>01583 <span class="comment">                */</span>
<a name="l01584"></a>01584                 rz_dst =
<a name="l01585"></a>01585                         SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01586"></a>01586                         rz_src-&gt;format-&gt;Rmask, rz_src-&gt;format-&gt;Gmask,
<a name="l01587"></a>01587                         rz_src-&gt;format-&gt;Bmask, rz_src-&gt;format-&gt;Amask);
<a name="l01588"></a>01588         } <span class="keywordflow">else</span> {
<a name="l01589"></a>01589                 <span class="comment">/*</span>
<a name="l01590"></a>01590 <span class="comment">                * Target surface is 8bit </span>
<a name="l01591"></a>01591 <span class="comment">                */</span>
<a name="l01592"></a>01592                 rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01593"></a>01593         }
<a name="l01594"></a>01594 
<a name="l01595"></a>01595         <span class="comment">/* Check target */</span>
<a name="l01596"></a>01596         <span class="keywordflow">if</span> (rz_dst == NULL) {
<a name="l01597"></a>01597                 haveError = 1;
<a name="l01598"></a>01598                 <span class="keywordflow">goto</span> exitShrinkSurface;
<a name="l01599"></a>01599         }
<a name="l01600"></a>01600 
<a name="l01601"></a>01601         <span class="comment">/* Adjust for guard rows */</span>
<a name="l01602"></a>01602         rz_dst-&gt;h = dstheight;
<a name="l01603"></a>01603 
<a name="l01604"></a>01604         <span class="comment">/*</span>
<a name="l01605"></a>01605 <span class="comment">        * Check which kind of surface we have </span>
<a name="l01606"></a>01606 <span class="comment">        */</span>
<a name="l01607"></a>01607         <span class="keywordflow">if</span> (is32bit==1) {
<a name="l01608"></a>01608                 <span class="comment">/*</span>
<a name="l01609"></a>01609 <span class="comment">                * Call the 32bit transformation routine to do the shrinking (using alpha) </span>
<a name="l01610"></a>01610 <span class="comment">                */</span>
<a name="l01611"></a>01611                 result = <a class="code" href="_s_d_l2__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512" title="Internal 32 bit integer-factor averaging Shrinker.">_shrinkSurfaceRGBA</a>(rz_src, rz_dst, factorx, factory);          
<a name="l01612"></a>01612                 <span class="keywordflow">if</span> ((result!=0) || (rz_dst==NULL)) {
<a name="l01613"></a>01613                         haveError = 1;
<a name="l01614"></a>01614                         <span class="keywordflow">goto</span> exitShrinkSurface;
<a name="l01615"></a>01615                 }
<a name="l01616"></a>01616         } <span class="keywordflow">else</span> {
<a name="l01617"></a>01617                 <span class="comment">/*</span>
<a name="l01618"></a>01618 <span class="comment">                * Copy palette and colorkey info </span>
<a name="l01619"></a>01619 <span class="comment">                */</span>
<a name="l01620"></a>01620                 <span class="keywordflow">for</span> (i = 0; i &lt; rz_src-&gt;format-&gt;palette-&gt;ncolors; i++) {
<a name="l01621"></a>01621                         rz_dst-&gt;format-&gt;palette-&gt;colors[i] = rz_src-&gt;format-&gt;palette-&gt;colors[i];
<a name="l01622"></a>01622                 }
<a name="l01623"></a>01623                 rz_dst-&gt;format-&gt;palette-&gt;ncolors = rz_src-&gt;format-&gt;palette-&gt;ncolors;
<a name="l01624"></a>01624                 <span class="comment">/*</span>
<a name="l01625"></a>01625 <span class="comment">                * Call the 8bit transformation routine to do the shrinking </span>
<a name="l01626"></a>01626 <span class="comment">                */</span>
<a name="l01627"></a>01627                 result = <a class="code" href="_s_d_l2__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be" title="Internal 8 bit integer-factor averaging shrinker.">_shrinkSurfaceY</a>(rz_src, rz_dst, factorx, factory);
<a name="l01628"></a>01628                 <span class="keywordflow">if</span> (result!=0) {
<a name="l01629"></a>01629                         haveError = 1;
<a name="l01630"></a>01630                         <span class="keywordflow">goto</span> exitShrinkSurface;
<a name="l01631"></a>01631                 }
<a name="l01632"></a>01632         }
<a name="l01633"></a>01633 
<a name="l01634"></a>01634 exitShrinkSurface:
<a name="l01635"></a>01635         <span class="keywordflow">if</span> (rz_src!=NULL) {
<a name="l01636"></a>01636                 <span class="comment">/*</span>
<a name="l01637"></a>01637 <span class="comment">                * Unlock source surface </span>
<a name="l01638"></a>01638 <span class="comment">                */</span>
<a name="l01639"></a>01639                 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01640"></a>01640                         SDL_UnlockSurface(rz_src);
<a name="l01641"></a>01641                 }
<a name="l01642"></a>01642 
<a name="l01643"></a>01643                 <span class="comment">/*</span>
<a name="l01644"></a>01644 <span class="comment">                * Cleanup temp surface </span>
<a name="l01645"></a>01645 <span class="comment">                */</span>
<a name="l01646"></a>01646                 <span class="keywordflow">if</span> (src_converted==1) {
<a name="l01647"></a>01647                         SDL_FreeSurface(rz_src);
<a name="l01648"></a>01648                 }
<a name="l01649"></a>01649         }
<a name="l01650"></a>01650 
<a name="l01651"></a>01651         <span class="comment">/* Check error state; maybe need to cleanup destination */</span>
<a name="l01652"></a>01652         <span class="keywordflow">if</span> (haveError==1) {
<a name="l01653"></a>01653                 <span class="keywordflow">if</span> (rz_dst!=NULL) {
<a name="l01654"></a>01654                         SDL_FreeSurface(rz_dst);
<a name="l01655"></a>01655                 }
<a name="l01656"></a>01656                 rz_dst=NULL;
<a name="l01657"></a>01657         } 
<a name="l01658"></a>01658 
<a name="l01659"></a>01659         <span class="comment">/*</span>
<a name="l01660"></a>01660 <span class="comment">        * Return destination surface </span>
<a name="l01661"></a>01661 <span class="comment">        */</span>
<a name="l01662"></a>01662         <span class="keywordflow">return</span> (rz_dst);
<a name="l01663"></a>01663 }
</pre></div></div><!-- contents -->


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